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| author | Stefan Hajnoczi | 2020-02-18 19:27:08 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi | 2020-02-22 09:26:47 +0100 |
| commit | f25c0b547916962d0b1be260b5b643287bea0851 (patch) | |
| tree | 15de99bb92f45f7ffd006085ccb8f5e6fcd40427 /tests/Makefile.include | |
| parent | virtio: increase virtqueue size for virtio-scsi and virtio-blk (diff) | |
| download | qemu-f25c0b547916962d0b1be260b5b643287bea0851.tar.gz qemu-f25c0b547916962d0b1be260b5b643287bea0851.tar.xz qemu-f25c0b547916962d0b1be260b5b643287bea0851.zip | |
aio-posix: avoid reacquiring rcu_read_lock() when polling
The first rcu_read_lock/unlock() is expensive. Nested calls are cheap.
This optimization increases IOPS from 73k to 162k with a Linux guest
that has 2 virtio-blk,num-queues=1 and 99 virtio-blk,num-queues=32
devices.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20200218182708.914552-1-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'tests/Makefile.include')
0 files changed, 0 insertions, 0 deletions