9445e1e15e
Automatically size the number of virtio-blk-pci request virtqueues to match the number of vCPUs. Other transports continue to default to 1 request virtqueue. A 1:1 virtqueue:vCPU mapping ensures that completion interrupts are handled on the same vCPU that submitted the request. No IPI is necessary to complete an I/O request and performance is improved. The maximum number of MSI-X vectors and virtqueues limit are respected. Performance improves from 78k to 104k IOPS on a 32 vCPU guest with 101 virtio-blk-pci devices (ioengine=libaio, iodepth=1, bs=4k, rw=randread with NVMe storage). Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com> Message-Id: <20200818143348.310613-7-stefanha@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> |
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.. | ||
dataplane | ||
block.c | ||
cdrom.c | ||
ecc.c | ||
fdc.c | ||
hd-geometry.c | ||
Kconfig | ||
m25p80.c | ||
meson.build | ||
nand.c | ||
nvme.c | ||
nvme.h | ||
onenand.c | ||
pflash_cfi01.c | ||
pflash_cfi02.c | ||
swim.c | ||
tc58128.c | ||
trace-events | ||
trace.h | ||
vhost-user-blk.c | ||
virtio-blk.c | ||
xen_blkif.h | ||
xen-block.c |