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Mark McLoughlin fc5b81d1f6 net: set a default value for sndbuf= 
On reflection, perhaps it does make sense to set a default value for
the sndbuf= tap parameter.

For best effect, sndbuf= should be set to just below the capacity of
the physical NIC.

Setting it higher will cause packets to be dropped before the limit
is hit. Setting it much lower will not cause any problems unless
you set it low enough such that the guest cannot queue up new packets
before the NIC has emptied its queue.

In Linux, txqueuelen=1000 by default for ethernet NICs. Given a 1500
byte MTU, 1Mb is a good choice for sndbuf.

If it turns out that txqueuelen is actually much lower than this, then
sndbuf is essentially disabled. In the event that txqueuelen is much
higher, it's unlikely that the NIC will be able to empty a 1Mb queue.

Thanks to Herbert Xu for this logic.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Cc: Herbert Xu <herbert.xu@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-07-09 16:06:37 -05:00
audio fix qemu_alloc/qemu_free for audio subsystem 2009-06-19 02:46:14 +04:00
block qcow2: Cache refcount blocks during snapshot creation 2009-06-29 14:18:07 -05:00
bsd-user Fix missing strnlen problems 2009-07-01 18:24:44 +00:00
darwin-user Replace gcc variadic macro extension with C99 version 2009-05-13 17:53:17 +00:00
fpu Fix OpenSolaris gcc4 warnings: iovec type mismatches, missing 'static' 2009-04-13 16:31:01 +00:00
gdb-xml Work around QEMU GDB stub suboptimality 2009-03-07 22:00:56 +00:00
hw qdev: convert ac97. 2009-07-09 13:07:03 +01:00
linux-user Merge commit 'linux-user/linux-user-for-upstream' into tmp-staging 2009-07-09 15:09:27 -05:00
pc-bios Update OpenBIOS images to r505 2009-07-05 18:50:32 +00:00
slirp Fix breakage by obsolete _P() for good 2009-07-01 19:11:17 +00:00
target-alpha qemu: introduce qemu_init_vcpu (Marcelo Tosatti) 2009-04-24 18:03:41 +00:00
target-arm Remove unused gen_bx_T0 function. 2009-06-24 09:09:15 -05:00
target-cris cris: Remove unused internal flag. 2009-06-23 10:27:00 +02:00
target-i386 QEMU: MCE: Add MCE simulation to qemu/tcg 2009-07-09 16:04:53 -05:00
target-m68k Convert machine registration to use module init functions 2009-05-21 08:47:55 -05:00
target-microblaze microblaze: Make writes to MMU_ZPR flush the TLB. 2009-05-27 01:19:58 +02:00
target-mips MIPS atomic instructions 2009-07-09 17:45:17 +01:00
target-ppc target-ppc: permit linux-user to read PVR 2009-06-23 21:11:22 +04:00
target-sh4 Convert machine registration to use module init functions 2009-05-21 08:47:55 -05:00
target-sparc Use correct type for SPARC cpu_cc_op 2009-06-06 02:54:03 +01:00
tcg Include assert.h from qemu-common.h 2009-05-13 20:54:26 +01:00
tests Replace gcc variadic macro extension with C99 version 2009-05-13 17:53:17 +00:00
.gitignore dot gitignore: add qemu-monitor.texi 2009-06-22 10:15:28 -05:00
a.out.h Remove unnecessary trailing newlines 2008-12-13 09:32:43 +00:00
acl.c Remove tabs introduced from VNC ACL series 2009-03-06 20:27:40 +00:00
acl.h Support ACLs for controlling VNC access ("Daniel P. Berrange") 2009-03-06 20:27:37 +00:00
aes.c Include assert.h from qemu-common.h 2009-05-13 20:54:26 +01:00
aes.h AES crypto support 2004-08-01 21:54:53 +00:00
aio.c fix qemu_aio_flush 2009-06-15 13:52:27 +02:00
alpha-dis.c Update FSF address in GPL/LGPL boilerplate 2009-01-04 22:05:52 +00:00
alpha.ld alpha support 2003-04-29 20:53:42 +00:00
arm-dis.c clean build: Fix arm build warnings 2009-03-07 21:48:00 +00:00
arm-semi.c Fix more FSF addresses 2009-01-05 18:11:53 +00:00
arm.ld Link ARM prologue closer to code segment to avoid a build failure 2008-07-10 17:21:31 +00:00
balloon.h Add missing file from previous commit. 2008-12-04 20:35:16 +00:00
block_int.h block: add bdrv_probe_device method 2009-06-15 14:04:22 +02:00
block.c Fix missing strnlen problems 2009-07-01 18:24:44 +00:00
block.h support colon in filenames 2009-06-29 13:50:05 -05:00
bswap.h Sparse fixes: truncation by cast 2009-03-07 15:46:23 +00:00
bt-host.c Fix OpenSolaris gcc4 warnings: iovec type mismatches, missing 'static' 2009-04-13 16:31:01 +00:00
bt-host.h Clean build: Add bt-host.h 2009-03-10 21:43:35 +00:00
bt-vhci.c Sparse fixes: NULL use, header order, ANSI prototypes, static 2009-03-07 15:32:56 +00:00
buffered_file.c introduce set_rate_limit function for QEMUFile 2009-05-22 10:50:30 -05:00
buffered_file.h Introduce a buffered file wrapper for QEMUFile 2008-10-13 03:10:22 +00:00
cache-utils.c Properly initialize len argument of sysctl and include stdio.h (perror) 2009-02-04 20:39:09 +00:00
cache-utils.h Remove all traces of __powerpc__ 2009-01-14 18:39:49 +00:00
Changelog Update Changelog to reflect 0.10.2 release 2009-04-07 02:19:41 +00:00
cmd.c Fix a few Sparse warnings 2009-04-07 17:57:09 +00:00
cmd.h Fix a few Sparse warnings 2009-04-07 17:57:09 +00:00
cocoa.m Update cocoa.m to match new DisplayState code (Samuel Benson) 2009-03-04 19:25:22 +00:00
CODING_STYLE Remove potentially offensive humor. 2009-04-07 02:10:16 +00:00
configure configure: detect xen with --extra-cflags / --extra-ldflags 2009-07-09 16:06:36 -05:00
console.c Delete some unused macros detected with -Wp,-Wunused-macros use 2009-03-16 16:33:01 +00:00
console.h sdl zooming 2009-06-29 08:52:44 -05:00
COPYING COPYING: update from FSF 2008-10-12 17:54:42 +00:00
COPYING.LIB Update FSF address in GPL/LGPL boilerplate 2009-01-04 22:05:52 +00:00
cpu-all.h QEMU: MCE: Add MCE simulation to qemu/tcg 2009-07-09 16:04:53 -05:00
cpu-common.h Remove io_index argument from cpu_register_io_memory() 2009-06-16 15:18:37 -05:00
cpu-defs.h fix gdbstub support for multiple threads in usermode, v3 2009-06-04 10:04:49 +01:00
cpu-exec.c QEMU: MCE: Add MCE simulation to qemu/tcg 2009-07-09 16:04:53 -05:00
cris-dis.c toplevel: remove error handling from qemu_malloc() callers (Avi Kivity) 2009-02-05 22:06:18 +00:00
curses_keys.h Sparse fixes: remove duplicate entry 2009-03-07 15:53:15 +00:00
curses.c DisplayAllocator interface (Stefano Stabellini) 2009-03-13 15:02:13 +00:00
cutils.c Fix missing strnlen problems 2009-07-01 18:24:44 +00:00
d3des.c Ansify to please sparse 2008-10-27 19:49:12 +00:00
d3des.h Actually add d3des implementation files. 2007-08-25 02:09:50 +00:00
def-helper.h Remove unnecessary trailing newlines 2008-12-13 09:32:43 +00:00
device_tree.c Remove unused variable 2009-05-24 21:24:33 +01:00
device_tree.h Wean device tree code off phys_ram_base. 2009-04-10 16:23:59 +00:00
dis-asm.h microblaze: Add disassembler. 2009-05-26 21:10:28 +02:00
disas.c microblaze: Add disassembler. 2009-05-26 21:10:28 +02:00
disas.h monitor: Rework API (Jan Kiszka) 2009-03-05 23:01:23 +00:00
dma-helpers.c fully split aio_pool from BlockDriver 2009-05-27 09:46:03 -05:00
dma.h fully split aio_pool from BlockDriver 2009-05-27 09:46:03 -05:00
dyngen-exec.h Use stdint.h for integral data types and definitions 2009-04-08 22:56:19 +00:00
elf_ops.h Fix elf loader range checking 2009-06-05 15:16:41 +01:00
elf.h linux-user: implemented ELF coredump support for ARM target 2009-06-16 16:56:28 +03:00
exec-all.h kqemu: merge CONFIG_KQEMU and USE_KQEMU 2009-04-19 10:18:01 +00:00
exec.c cpu_unregister_map_client: fix memory leak. 2009-06-29 14:18:06 -05:00
feature_to_c.sh Fix undeclared symbol warnings from sparse 2008-10-26 13:43:07 +00:00
gdbstub.c fix gdbstub support for multiple threads in usermode, v3 2009-06-04 10:04:49 +01:00
gdbstub.h Guest debugging support for KVM (Jan Kiszka) 2009-03-12 20:12:48 +00:00
gen-icount.h Remove unnecessary trailing newlines 2008-12-13 09:32:43 +00:00
host-utils.c Code used by the linux-user targets should not use vl.h. 2007-11-05 13:01:41 +00:00
host-utils.h Include <strings.h> for ffs(). 2008-11-12 17:18:41 +00:00
hostregs_helper.h Prune unused AREGs 2009-03-08 12:41:36 +00:00
hpet.h Add a local copy of hpet.h. 2007-09-16 20:03:23 +00:00
hppa-dis.c HPPA (PA-RISC) host support 2008-04-12 20:14:54 +00:00
hppa.ld HPPA (PA-RISC) host support 2008-04-12 20:14:54 +00:00
hxtool Fix hxtool. 2009-07-02 17:54:34 +00:00
i386-dis.c Update i386-dis.c from commits before GPLv3 switch 2009-03-07 16:57:53 +00:00
i386.ld Add TLS sections. 2008-05-31 16:21:33 +00:00
ia64.ld ia64 host support (David Mosberger) 2005-04-07 22:20:31 +00:00
keymaps.c Use relative path for bios 2009-05-30 01:59:37 +01:00
keymaps.h Add missing file from previous commit 2009-03-06 22:47:54 +00:00
kqemu.c Remove io_index argument from cpu_register_io_memory() 2009-06-16 15:18:37 -05:00
kqemu.h kqemu API change - allow use of kqemu with 32 bit QEMU on a 64 bit host 2008-05-30 20:48:25 +00:00
kvm-all.c Revert "Introduce reset notifier order" 2009-06-29 14:18:08 -05:00
kvm.h kvm: Rework VCPU synchronization 2009-06-29 14:18:07 -05:00
libfdt_env.h Implement device tree support needed for Bamboo emulation 2008-12-16 10:43:48 +00:00
LICENSE Add missing newline at the end of file 2008-12-14 08:50:18 +00:00
loader.c Fix prototype of function zfree. 2009-06-13 19:19:25 -05:00
m68k-dis.c Spelling and grammar fixes 2008-11-30 16:25:37 +00:00
m68k-semi.c Fix more FSF addresses 2009-01-05 18:11:53 +00:00
m68k.ld m68k host port (Richard Zidlicky) 2003-08-10 22:14:22 +00:00
MAINTAINERS Update maintainer list. 2009-05-28 14:00:49 +02:00
Makefile Fix sdl_zoom compile problems on OpenBSD 2009-07-01 18:49:34 +00:00
Makefile.hw Rename OBJS to obj-y 2009-06-29 14:18:06 -05:00
Makefile.target Fix typo 2009-06-30 18:47:48 +04:00
microblaze-dis.c microblaze-dis.c does not need to be executable 2009-06-09 18:27:02 +00:00
migration-exec.c Allow monitor interaction when using migrate -exec 2009-05-27 09:46:07 -05:00
migration-tcp.c Cast pointer arguments of get/setsockopt, send to void * to keep GCC 2009-05-21 05:30:51 +04:00
migration.c set migration max downtime 2009-06-16 15:52:32 -05:00
migration.h set migration max downtime 2009-06-16 15:52:32 -05:00
mips-dis.c Update FSF address in GPL/LGPL boilerplate 2009-01-04 22:05:52 +00:00
mips.ld Linker scripts for MIPS hosts. 2007-05-05 19:24:38 +00:00
mipsel.ld Linker scripts for MIPS hosts. 2007-05-05 19:24:38 +00:00
module.c Fix module initialization when more than 1 class is in use 2009-05-14 18:06:49 -05:00
module.h Convert machine registration to use module init functions 2009-05-21 08:47:55 -05:00
monitor.c QEMU: MCE: Add MCE simulation to qemu/tcg 2009-07-09 16:04:53 -05:00
monitor.h monitor: Introduce MONITOR_USE_READLINE flag (Jan Kiszka) 2009-03-05 23:01:51 +00:00
nbd.c Cast pointer arguments of get/setsockopt, send to void * to keep GCC 2009-05-21 05:30:51 +04:00
nbd.h Update FSF address in GPL/LGPL boilerplate 2009-01-04 22:05:52 +00:00
net-checksum.c Update FSF address in GPL/LGPL boilerplate 2009-01-04 22:05:52 +00:00
net.c net: set a default value for sndbuf= 2009-07-09 16:06:37 -05:00
net.h slirp: Make hostfwd_add/remove multi-instance-aware 2009-06-29 08:52:50 -05:00
osdep.c Add out of memory and zero size argument checks to be consistent with 2009-07-08 18:24:05 +04:00
osdep.h snapshot subcommand for qemu-img (Kevin Wolf) 2009-01-07 17:40:15 +00:00
pci-ids.txt List virtio console device in pci-ids.txt 2009-01-24 16:37:31 +00:00
posix-aio-compat.c fix asynchronous ioctls 2009-05-08 15:51:19 -05:00
posix-aio-compat.h push down vector linearization to posix-aio-compat.c (Christoph Hellwig) 2009-04-07 18:43:24 +00:00
ppc64.ld Correct version of Heikki Lindholms ppc64.ld script 2008-08-20 22:39:24 +00:00
ppc-dis.c Update ppc-dis.c from binutils from 4th July, 2007, just before GPLv3 switch 2009-02-09 19:59:57 +00:00
ppc.ld Update ppc.ld to work with newer binutils. 2007-04-28 19:00:30 +00:00
qemu_socket.h Fix windows build and clean up use of <windows.h> 2009-03-08 16:26:59 +00:00
qemu-aio.h fix qemu_aio_flush 2009-06-15 13:52:27 +02:00
qemu-binfmt-conf.sh Code provision for n32/n64 mips userland emulation. Not functional yet. 2007-09-30 01:58:33 +00:00
qemu-char.c mux-term: Fix timestamp association 2009-06-16 15:18:37 -05:00
qemu-char.h monitor: Improve mux'ed console experience (Jan Kiszka) 2009-03-05 23:01:47 +00:00
qemu-common.h Fix missing strnlen problems 2009-07-01 18:24:44 +00:00
qemu-doc.texi doc: Update information on supported network adapters. 2009-06-06 19:22:44 +03:00
qemu-img-cmds.hx Use hxtool for qemu-img command list 2009-06-07 09:59:47 +03:00
qemu-img.c Use hxtool for qemu-img command list 2009-06-07 09:59:47 +03:00
qemu-img.texi Use hxtool for qemu-img command list 2009-06-07 09:59:47 +03:00
qemu-io.c qemu-io: add aio read/write/flush commands 2009-06-24 09:09:15 -05:00
qemu-lock.h Remove all traces of __powerpc__ 2009-01-14 18:39:49 +00:00
qemu-log.h Define macros that will become the new logging API (Eduardo Habkost) 2009-01-15 21:52:11 +00:00
qemu-malloc.c Format per CODING_STYLE 2009-05-19 22:29:20 +04:00
qemu-monitor.hx QEMU: MCE: Add MCE simulation to qemu/tcg 2009-07-09 16:04:53 -05:00
qemu-nbd.c Fix warning in qemu-nbd.c 2009-06-15 12:51:37 -05:00
qemu-nbd.texi Fix formatting of documentation (Stefan Weil) 2008-09-22 20:41:57 +00:00
qemu-option.c qemu-img: Print available options with -o ? 2009-06-06 18:38:57 +03:00
qemu-option.h qemu-img: Print available options with -o ? 2009-06-06 18:38:57 +03:00
qemu-options.hx net: set a default value for sndbuf= 2009-07-09 16:06:37 -05:00
qemu-sockets.c Fix in file qemu-sockets.c 2009-05-08 16:11:49 -05:00
qemu-tech.texi Update docs on dynamic condition code calculation 2009-05-10 18:23:46 +00:00
qemu-thread.c qemu: mutex/thread/cond wrappers and configure tweaks (Marcelo Tosatti) 2009-04-24 18:03:15 +00:00
qemu-thread.h qemu: mutex/thread/cond wrappers and configure tweaks (Marcelo Tosatti) 2009-04-24 18:03:15 +00:00
qemu-timer.h Break up vl.h. 2007-11-17 17:14:51 +00:00
qemu-tool.c monitor: Rework API (Jan Kiszka) 2009-03-05 23:01:23 +00:00
qemu.sasl Add SASL authentication support ("Daniel P. Berrange") 2009-03-06 20:27:28 +00:00
readline.c readline: Remove unneeded qemu_mallocz() check 2009-06-16 15:18:37 -05:00
readline.h monitor: Improve mux'ed console experience (Jan Kiszka) 2009-03-05 23:01:47 +00:00
README Add missing newline at the end of file 2008-12-14 08:50:18 +00:00
rules.mak Remove bogus -Werror 2009-06-30 12:10:52 +01:00
s390-dis.c Remove unnecessary trailing newlines 2008-12-13 09:32:43 +00:00
s390.ld Remove unnecessary trailing newlines 2008-12-13 09:32:43 +00:00
savevm.c exec-migration: handle EINTR in popen_get_buffer() 2009-06-13 19:19:25 -05:00
sdl_keysym.h Refactor keymap code to avoid duplication ("Daniel P. Berrange") 2009-03-06 20:27:10 +00:00
sdl_zoom_template.h sdl zooming 2009-06-29 08:52:44 -05:00
sdl_zoom.c Fix sdl_zoom compile problems on OpenBSD 2009-07-01 18:49:34 +00:00
sdl_zoom.h Remove SDL/ prefix 2009-07-08 18:25:37 +04:00
sdl.c sdl: Fix memory leakage 2009-06-29 14:18:08 -05:00
sh4-dis.c Update FSF address in GPL/LGPL boilerplate 2009-01-04 22:05:52 +00:00
softmmu_defs.h Fix some warnings that would be generated by gcc -Wredundant-decls 2008-08-30 09:51:20 +00:00
softmmu_exec.h Allow 5 mmu indexes. 2009-04-07 21:47:27 +00:00
softmmu_header.h Update FSF address in GPL/LGPL boilerplate 2009-01-04 22:05:52 +00:00
softmmu_template.h kqemu: merge CONFIG_KQEMU and USE_KQEMU 2009-04-19 10:18:01 +00:00
softmmu-semi.h Suppress gcc 4.x -Wpointer-sign (included in -Wall) warnings 2008-09-20 08:07:15 +00:00
sparc64.ld Map code buffers below 2G on Sparc64 2008-07-26 15:05:57 +00:00
sparc-dis.c Make OpenBSD sparc-softmmu compile warning free 2009-01-14 18:08:08 +00:00
sparc.ld More detabification 2007-10-06 11:28:21 +00:00
sys-queue.h Remove CRs 2008-12-14 08:53:17 +00:00
sysemu.h Replace -no-virtio-balloon by -balloon 2009-06-29 14:18:08 -05:00
tap-win32.c net: add return value to packet receive handler 2009-06-09 11:38:49 +01:00
targphys.h kvm: Mark full address range dirty on live migration start 2009-05-28 02:14:56 -05:00
texi2pod.pl Update texi2pod.pl. 2008-02-04 14:47:49 +00:00
thunk.c Update FSF address in GPL/LGPL boilerplate 2009-01-04 22:05:52 +00:00
thunk.h Update FSF address in GPL/LGPL boilerplate 2009-01-04 22:05:52 +00:00
TODO Update 2008-12-04 11:29:42 +00:00
tool-osdep.c Add tool_osdep.c 2009-05-13 22:21:47 +01:00
translate-all.c global s/loglevel & X/qemu_loglevel_mask(X)/ (Eduardo Habkost) 2009-01-15 22:36:53 +00:00
uboot_image.h Update FSF address in GPL/LGPL boilerplate 2009-01-04 22:05:52 +00:00
usb-bsd.c Support for DragonFly BSD (Hasso Tepper) 2009-03-07 20:06:23 +00:00
usb-linux.c USB serial device support 2009-05-22 10:50:35 -05:00
usb-stub.c monitor: Rework API (Jan Kiszka) 2009-03-05 23:01:23 +00:00
VERSION Update the version information to 0.10.50 to signify development branch 2009-04-08 13:14:12 +00:00
vgafont.h Some little fixes on QEMU 2008-09-06 16:31:30 +00:00
vl.c Replace -no-virtio-balloon by -balloon 2009-06-29 14:18:08 -05:00
vnc_keysym.h Refactor keymap code to avoid duplication ("Daniel P. Berrange") 2009-03-06 20:27:10 +00:00
vnc-auth-sasl.c Remove tabs introduced from VNC ACL series 2009-03-06 20:27:40 +00:00
vnc-auth-sasl.h Support ACLs for controlling VNC access ("Daniel P. Berrange") 2009-03-06 20:27:37 +00:00
vnc-auth-vencrypt.c Add more missing files 2009-03-06 23:44:29 +00:00
vnc-auth-vencrypt.h Add more missing files 2009-03-06 23:44:29 +00:00
vnc-tls.c Add more missing files 2009-03-06 23:44:29 +00:00
vnc-tls.h Add more missing files 2009-03-06 23:44:29 +00:00
vnc.c vnc: improve numpad support for qemu console. 2009-06-16 15:18:39 -05:00
vnc.h vnc: throttle screen updates. (Gerd Hoffmann) 2009-03-20 15:59:24 +00:00
vnchextile.h vnc: cleanup surface handling, fix screen corruption bug. (Gerd Hoffmann) 2009-03-20 15:59:14 +00:00
x86_64.ld update 2005-01-06 20:50:00 +00:00
x_keymap.c Fix SDL on evdev hosts (Anthony Liguori) 2009-03-03 17:37:21 +00:00
x_keymap.h Fix SDL on evdev hosts (Anthony Liguori) 2009-03-03 17:37:21 +00:00

README 

Read the documentation in qemu-doc.html.

Fabrice Bellard.