similar to: presentation at kvm forum and pagefaults

On 2019/10/24 ??11:26, Liu, Yong wrote: > >> -----Original Message----- >> From: Jason Wang [mailto:jasowang at redhat.com] >> Sent: Tuesday, October 22, 2019 9:06 PM >> To: Liu, Yong <yong.liu at intel.com>; mst at redhat.com; Bie, Tiwei >> <tiwei.bie at intel.com> >> Cc: virtualization at lists.linux-foundation.org >> Subject: Re: [PATCH]

Hi! Anyone else experiencing performance problems when using the new monorepo? My experience is that performance of gitk (and git log) sometimes is really bad when working in the monorepo. I've mainly seen it when using gitk on specific files/directories, but since gitk seems to be using "git log --no-color -z --pretty=raw --show-notes --parents --boundary HEAD -- <file>" it

Óscar Fuentes <ofv at wanadoo.es> writes: > Nico Weber <thakis at chromium.org> writes: > >> On Tue, Nov 1, 2011 at 3:09 PM, David A. Greene <greened at obbligato.org> wrote: >>> Óscar Fuentes <ofv at wanadoo.es> writes: >>> >>>> Okay, we can get rid of recursive make. However, as pointed out >>>> elsewhere, removing

On Fri, Nov 23, 2018 at 11:00:16AM +0800, Jason Wang wrote: > Device use descriptors table in order, so there's no need to read > index from available ring. This eliminate the cache contention on > avail ring completely. Well this isn't what the in order feature says in the spec. It forces the used ring to be in the same order as the available ring. So I don't think you can

Hi: This series implement basic in order feature support for vhost_net. This feature requires both driver and device to use descriptors in order which can simplify the implementation and optimizaton for both side. The series also implement a simple optimization that avoid read available ring. Test shows 10% performance improvement. More optimizations could be done on top. Jason Wang (3):

On Thu, Oct 11, 2018 at 08:12:21PM +0800, Tiwei Bie wrote: > > > But if it's not too late, I second for a OUT_OF_ORDER feature. > > > Starting from in order can have much simpler code in driver. > > > > > > Thanks > > > > It's tricky to change the flag polarity because of compatibility > > with legacy interfaces. Why is this such a

On Tue, Nov 01, 2011 at 06:27:35PM -0500, David A. Greene wrote: > Here is actual data comparing an empty LLVM build done recursively (the > LLVM build) and non-recursively (the Cray build). > > See this? > > 0inputs+0outputs (0major+671804minor)pagefaults 0swaps > > vs. this? > > 0inputs+0outputs (0major+184605minor)pagefaults 0swaps > > That's I/O.

On Tue, Dec 25, 2018 at 06:05:25PM +0800, Jason Wang wrote: > > On 2018/12/25 ??2:10, Michael S. Tsirkin wrote: > > On Mon, Dec 24, 2018 at 03:53:16PM +0800, Jason Wang wrote: > > > On 2018/12/14 ??8:36, Michael S. Tsirkin wrote: > > > > On Fri, Dec 14, 2018 at 11:57:35AM +0800, Jason Wang wrote: > > > > > On 2018/12/13 ??11:44, Michael S. Tsirkin

On Tue, Dec 25, 2018 at 06:05:25PM +0800, Jason Wang wrote: > > On 2018/12/25 ??2:10, Michael S. Tsirkin wrote: > > On Mon, Dec 24, 2018 at 03:53:16PM +0800, Jason Wang wrote: > > > On 2018/12/14 ??8:36, Michael S. Tsirkin wrote: > > > > On Fri, Dec 14, 2018 at 11:57:35AM +0800, Jason Wang wrote: > > > > > On 2018/12/13 ??11:44, Michael S. Tsirkin

On Wed, Dec 26, 2018 at 11:57:32AM +0800, Jason Wang wrote: > > On 2018/12/25 ??8:50, Michael S. Tsirkin wrote: > > On Tue, Dec 25, 2018 at 06:05:25PM +0800, Jason Wang wrote: > > > On 2018/12/25 ??2:10, Michael S. Tsirkin wrote: > > > > On Mon, Dec 24, 2018 at 03:53:16PM +0800, Jason Wang wrote: > > > > > On 2018/12/14 ??8:36, Michael S. Tsirkin

On Wed, Dec 26, 2018 at 11:57:32AM +0800, Jason Wang wrote: > > On 2018/12/25 ??8:50, Michael S. Tsirkin wrote: > > On Tue, Dec 25, 2018 at 06:05:25PM +0800, Jason Wang wrote: > > > On 2018/12/25 ??2:10, Michael S. Tsirkin wrote: > > > > On Mon, Dec 24, 2018 at 03:53:16PM +0800, Jason Wang wrote: > > > > > On 2018/12/14 ??8:36, Michael S. Tsirkin

On Thu, Sep 13, 2018 at 05:47:29PM +0800, Jason Wang wrote: > > > On 2018?09?13? 16:59, Tiwei Bie wrote: > > > If what you say is true then we should take a careful look > > > and not supporting these generic things with packed layout. > > > Once we do support them it will be too late and we won't > > > be able to get performance back. > > I

On Fri, Nov 23, 2018 at 11:00:15AM +0800, Jason Wang wrote: > This makes vhost_net to support in order feature. This is as simple as > use datacopy path when it was negotiated. An alternative is not to > advertise in order when zerocopy is enabled which tends to be > suboptimal consider zerocopy may suffer from e.g HOL issues. Well IIRC vhost_zerocopy_signal_used is used to actually

On Thu, Dec 27, 2018 at 05:39:21PM +0800, Jason Wang wrote: > > On 2018/12/26 ??11:02, Michael S. Tsirkin wrote: > > On Wed, Dec 26, 2018 at 11:57:32AM +0800, Jason Wang wrote: > > > On 2018/12/25 ??8:50, Michael S. Tsirkin wrote: > > > > On Tue, Dec 25, 2018 at 06:05:25PM +0800, Jason Wang wrote: > > > > > On 2018/12/25 ??2:10, Michael S. Tsirkin

On Thu, Oct 11, 2018 at 10:13:31PM +0800, Tiwei Bie wrote: > On Thu, Oct 11, 2018 at 09:48:48AM -0400, Michael S. Tsirkin wrote: > > On Thu, Oct 11, 2018 at 08:12:21PM +0800, Tiwei Bie wrote: > > > > > But if it's not too late, I second for a OUT_OF_ORDER feature. > > > > > Starting from in order can have much simpler code in driver. > > > >

On 2019/10/22 ??2:48, Liu, Yong wrote: > Hi Jason, > My answers are inline. > >> -----Original Message----- >> From: Jason Wang [mailto:jasowang at redhat.com] >> Sent: Tuesday, October 22, 2019 10:45 AM >> To: Liu, Yong <yong.liu at intel.com>; mst at redhat.com; Bie, Tiwei >> <tiwei.bie at intel.com> >> Cc: virtualization at

Hi there. First of all, I'd like to congratulate to developers for making a free specification and LGPLed decoder/encoder. :-). I did some test, ripping 17 tracks of my CD and converting them to both MP3 and OGG format. MP3 encoder/player was Lame 3.70 OGG encoder/player was from a Saturday nightly tgz package. ------------------------------------ MP3: LAME-3.70 mpg123-0.59r-4 MP3: lame -S

Hi there. First of all, I'd like to congratulate to developers for making a free specification and LGPLed decoder/encoder. :-). I did some test, ripping 17 tracks of my CD and converting them to both MP3 and OGG format. MP3 encoder/player was Lame 3.70 OGG encoder/player was from a Saturday nightly tgz package. ------------------------------------ MP3: LAME-3.70 mpg123-0.59r-4 MP3: lame -S

On 2019/10/22 ??1:10, Marvin Liu wrote: > When callback is delayed, virtio expect that vhost will kick when > rolling over event offset. Recheck should be taken as used index may > exceed event offset between status check and driver event update. > > However, it is possible that flags was not modified if descriptors are > chained or in_order feature was negotiated. So flags at

On Tue, Oct 22, 2019 at 01:10:04AM +0800, Marvin Liu wrote: > When callback is delayed, virtio expect that vhost will kick when > rolling over event offset. Recheck should be taken as used index may > exceed event offset between status check and driver event update. > > However, it is possible that flags was not modified if descriptors are > chained or in_order feature was