On Mon, Jan 16, 2017 at 10:00 AM, Karl Rister wrote:
> On 01/16/2017 07:15 AM, Stefan Hajnoczi wrote:
>> On Tue, Jan 03, 2017 at 12:02:14PM -0500, Weiwei Jia wrote:
The expensive part is the virtqueue kick. Recently we tried polling the
virtqueue instead of waiting for the ioeventfd fil
On Mon, Jan 16, 2017 at 8:15 AM, Stefan Hajnoczi wrote:
> On Tue, Jan 03, 2017 at 12:02:14PM -0500, Weiwei Jia wrote:
>> > The expensive part is the virtqueue kick. Recently we tried polling the
>> > virtqueue instead of waiting for the ioeventfd file descriptor and got
>> > double-digit performa
On 01/16/2017 07:15 AM, Stefan Hajnoczi wrote:
> On Tue, Jan 03, 2017 at 12:02:14PM -0500, Weiwei Jia wrote:
>>> The expensive part is the virtqueue kick. Recently we tried polling the
>>> virtqueue instead of waiting for the ioeventfd file descriptor and got
>>> double-digit performance improveme
On Tue, Jan 03, 2017 at 12:02:14PM -0500, Weiwei Jia wrote:
> > The expensive part is the virtqueue kick. Recently we tried polling the
> > virtqueue instead of waiting for the ioeventfd file descriptor and got
> > double-digit performance improvements:
> > https://lists.gnu.org/archive/html/qemu-
Hi Stefan,
Thanks for your reply.
On Tue, Jan 3, 2017 at 10:50 AM, Stefan Hajnoczi wrote:
> On Thu, Dec 22, 2016 at 01:34:47AM -0500, Weiwei Jia wrote:
>> With QEMU x-data-plane, I find the performance has not been improved
>> very much. Please see following two settings.
>
> Using IOThreads imp
On Thu, Dec 22, 2016 at 01:34:47AM -0500, Weiwei Jia wrote:
> With QEMU x-data-plane, I find the performance has not been improved
> very much. Please see following two settings.
Using IOThreads improves scalability for SMP guests with many disks. It
does not improve performance for a single disk
Hi,
With QEMU x-data-plane, I find the performance has not been improved
very much. Please see following two settings.
Setting 1: I/O thread in host OS (VMM) reads 4KB each time from disk
(8GB in total). Pin the I/O thread to pCPU 5 which will serve I/O
thread dedicatedly. I find the performance