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5c0919d020
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Richard W.M. Jones 5c0919d020 virtio-scsi: Add virtqueue_size parameter allowing virtqueue size to be set. 
Since Linux switched to blk-mq as the default in Linux commit
5c279bd9e406 ("scsi: default to scsi-mq"), virtio-scsi LUNs consume
about 10x as much guest kernel memory.

This commit allows you to choose the virtqueue size for each
virtio-scsi-pci controller like this:

  -device virtio-scsi-pci,id=scsi,virtqueue_size=16

The default is still 128 as before.  Using smaller virtqueue_size
allows many more disks to be added to small memory virtual machines.
For a 1 vCPU, 500 MB, no swap VM I observed:

  With scsi-mq enabled (upstream kernel):              175 disks
    -"- ditto -"-   virtqueue_size=64:                 318 disks
    -"- ditto -"-   virtqueue_size=16:                 775 disks
  With scsi-mq disabled (kernel before 5c279bd9e406): 1755 disks

Note that to have any effect, this requires a kernel patch:

  https://lkml.org/lkml/2017/8/10/689

Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
Message-Id: <20170810165255.20865-1-rjones@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-09-19 14:09:11 +02:00
..
9pfs 9pfs: local: clarify fchmodat_nofollow() implementation 2017-09-05 17:56:58 +02:00
acpi vmgenid: replace x-write-pointer-available hack 2017-09-08 16:15:17 +03:00
adc
alpha alpha: replace cpu_alpha_init() with cpu_generic_init() 2017-09-01 11:54:24 -03:00
arm mps2-an511: Fix wiring of UART overflow interrupt lines 2017-09-14 18:43:19 +01:00
audio audio: intel-hda: do not use old_mmio accesses 2017-09-18 13:13:32 +02:00
block hw/block/fdc: Convert to realize 2017-09-18 19:43:38 -04:00
bt bt: stop the sdp memory allocation craziness 2017-08-01 17:27:33 +02:00
char qapi: Mechanically convert FOO_lookup[...] to FOO_str(...) 2017-09-04 13:09:13 +02:00
core fw_cfg: rename read callback 2017-09-08 16:15:17 +03:00
cpu cpu: don't allow negative core id 2017-08-02 18:30:13 -03:00
cris cris: replace cpu_cris_init() with cpu_generic_init() 2017-09-01 11:54:24 -03:00
display virtio-gpu: don't clear QemuUIInfo information on reset 2017-09-13 09:39:32 +02:00
dma xilinx_axidma: Convert to DEFINE_PROP_LINK 2017-09-07 13:54:51 +01:00
gpio qdev: Replace cannot_instantiate_with_device_add_yet with !user_creatable 2017-05-17 10:37:00 -03:00
i2c ppc4xx_i2c: Move to hw/i2c 2017-09-08 09:30:55 +10:00
i386 intel_iommu: fix missing BQL in pt fast path 2017-09-08 16:15:17 +03:00
ide hw/ide: Convert DeviceClass init to realize 2017-09-18 19:43:38 -04:00
input qapi: Mechanically convert FOO_lookup[...] to FOO_str(...) 2017-09-04 13:09:13 +02:00
intc ppc patch queue 2017-09-15 2017-09-15 19:00:16 +01:00
ipack
ipmi qom: enforce readonly nature of link's check callback 2017-07-14 12:04:42 +02:00
isa trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
lm32 lm32: replace cpu_lm32_init() with cpu_generic_init() 2017-09-01 11:54:25 -03:00
m68k m68k: replace cpu_m68k_init() with cpu_generic_init() 2017-09-01 11:54:24 -03:00
mem qmp: introduce query-memory-size-summary command 2017-09-14 15:52:10 +01:00
microblaze hw: Use new memory_region_init_{ram, rom, rom_device}() functions 2017-07-14 17:59:42 +01:00
mips mips: Add KVM T&E segment support for TCG 2017-08-02 22:18:06 +01:00
misc mmio-interface: Mark as not user creatable 2017-08-15 17:42:02 +01:00
moxie moxie: replace cpu_moxie_init() with cpu_generic_init() 2017-09-01 11:54:25 -03:00
net net: Add SunGEM device emulation as found on Apple UniNorth 2017-09-15 10:29:48 +10:00
nios2 nios2: replace cpu_nios2_init() with cpu_generic_init() 2017-09-01 11:54:24 -03:00
nvram pc, pci, virtio: patches queued before 2.10 2017-09-08 16:04:42 +01:00
openrisc openrisc: replace cpu_openrisc_init() with cpu_generic_init() 2017-09-01 11:54:25 -03:00
pci net: Add SunGEM device emulation as found on Apple UniNorth 2017-09-15 10:29:48 +10:00
pci-bridge hw/pci: add QEMU-specific PCI capability to the Generic PCI Express Root Port 2017-09-08 16:15:17 +03:00
pci-host hw/pci-host/gpex: Implement PCI INTx routing 2017-09-14 18:43:19 +01:00
pcmcia
ppc spapr_events: use QTAILQ_FOREACH_SAFE() in spapr_clear_pending_events() 2017-09-15 10:29:48 +10:00
s390x s390x/pci: fixup trap_msix() 2017-08-30 18:23:26 +02:00
scsi virtio-scsi: Add virtqueue_size parameter allowing virtqueue size to be set. 2017-09-19 14:09:11 +02:00
sd trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
sh4 sh4: replace cpu_sh4_init() with cpu_generic_init() 2017-09-01 11:54:24 -03:00
smbios
sparc sparc: replace cpu_sparc_init() with cpu_generic_init() 2017-09-01 11:54:24 -03:00
sparc64 apb: fix up PCI bus nomenclature 2017-09-04 18:41:01 +01:00
ssi xlnx-qspi: add a property for mmio-execution 2017-08-14 14:17:18 +01:00
timer i8254: use QEMU_ALIGN_DOWN 2017-08-31 12:29:07 +02:00
tpm
tricore tricore: replace cpu_tricore_init() with cpu_generic_init() 2017-09-01 11:54:24 -03:00
unicore32 unicore32: replace uc32_cpu_init() with cpu_generic_init() 2017-09-01 11:54:25 -03:00
usb usb: only build usb-host with CONFIG_USB=y 2017-09-13 10:44:49 +02:00
vfio vfio, spapr: Fix levels calculation 2017-09-15 10:29:48 +10:00
virtio vhost: Release memory references on cleanup 2017-09-08 16:15:17 +03:00
watchdog watchdog: wdt_aspeed: Add support for the reset width register 2017-09-04 15:21:54 +01:00
xen trace-events: fix code style: %# -> 0x% 2017-08-01 12:13:07 +01:00
xenpv xenfb: remove xen_init_display "temporary" hack 2017-07-07 11:10:03 -07:00
xtensa xtensa: replace cpu_xtensa_init() with cpu_generic_init() 2017-09-01 11:54:24 -03:00
Makefile.objs 9pfs: fix dependencies 2017-08-30 18:23:25 +02:00