On Thu, Jul 07, 2022 at 10:04:23AM +0100, Stefan Hajnoczi wrote:
>
>Does this patch solve the issue? The idea is to defer
>poll_set_started(false) for as long as possible.
Good idea! It is straightforward.
>
>diff --git a/util/aio-posix.c b/util/aio-posix.c
>index 731f3826c0..536f8b2534 100644
On Wed, Jul 06, 2022 at 10:12:14PM +0800, Chao Gao wrote:
> On Wed, Jul 06, 2022 at 12:59:29PM +0100, Stefan Hajnoczi wrote:
> >On Fri, Jul 01, 2022 at 05:13:48PM +0800, Chao Gao wrote:
> >> When measuring FIO read performance (cache=writethrough, bs=4k,
> >> iodepth=64) in
> >> VMs, we observe
On Wed, Jul 06, 2022 at 12:59:29PM +0100, Stefan Hajnoczi wrote:
>On Fri, Jul 01, 2022 at 05:13:48PM +0800, Chao Gao wrote:
>> When measuring FIO read performance (cache=writethrough, bs=4k, iodepth=64)
>> in
>> VMs, we observe ~80K/s notifications (e.g., EPT_MISCONFIG) from guest to
>> qemu.
>
On Fri, Jul 01, 2022 at 05:13:48PM +0800, Chao Gao wrote:
> When measuring FIO read performance (cache=writethrough, bs=4k, iodepth=64) in
> VMs, we observe ~80K/s notifications (e.g., EPT_MISCONFIG) from guest to qemu.
It's not clear to me what caused the frequent poll_set_started(ctx,
false)
When measuring FIO read performance (cache=writethrough, bs=4k, iodepth=64) in
VMs, we observe ~80K/s notifications (e.g., EPT_MISCONFIG) from guest to qemu.
Currently, poll_set_started(ctx,false) is called in try_poll_mode() to enable
virtqueue notification in below 4 cases:
1. ctx->poll_ns is
