Re: [PATCH net-next] vhost_net: do not stall on zerocopy depletion

2017-10-02 Thread Willem de Bruijn
On Fri, Sep 29, 2017 at 9:25 PM, Willem de Bruijn wrote: > On Fri, Sep 29, 2017 at 3:38 PM, Michael S. Tsirkin wrote: >> On Wed, Sep 27, 2017 at 08:25:56PM -0400, Willem de Bruijn wrote: >>> From: Willem de Bruijn >>> >>> Vhost-net has a hard limit on the number of zerocopy skbs in flight. >>> W

Re: [PATCH net-next] vhost_net: do not stall on zerocopy depletion

2017-10-01 Thread Michael S. Tsirkin
On Fri, Sep 29, 2017 at 09:25:27PM -0400, Willem de Bruijn wrote: > On Fri, Sep 29, 2017 at 3:38 PM, Michael S. Tsirkin wrote: > > On Wed, Sep 27, 2017 at 08:25:56PM -0400, Willem de Bruijn wrote: > >> From: Willem de Bruijn > >> > >> Vhost-net has a hard limit on the number of zerocopy skbs in f

Re: [kbuild-all] [PATCH net-next] vhost_net: do not stall on zerocopy depletion

2017-09-30 Thread Fengguang Wu
On Sun, Oct 01, 2017 at 06:20:49AM +0300, Michael S. Tsirkin wrote: On Sun, Oct 01, 2017 at 08:09:30AM +0800, kbuild test robot wrote: Hi Willem, [auto build test WARNING on net-next/master] url: https://github.com/0day-ci/linux/commits/Willem-de-Bruijn/vhost_net-do-not-stall-on-zerocopy-d

Re: [PATCH net-next] vhost_net: do not stall on zerocopy depletion

2017-09-30 Thread Michael S. Tsirkin
On Sun, Oct 01, 2017 at 08:09:30AM +0800, kbuild test robot wrote: > Hi Willem, > > [auto build test WARNING on net-next/master] > > url: > https://github.com/0day-ci/linux/commits/Willem-de-Bruijn/vhost_net-do-not-stall-on-zerocopy-depletion/20171001-054709 > reproduce: > # apt-get i

Re: [PATCH net-next] vhost_net: do not stall on zerocopy depletion

2017-09-30 Thread kbuild test robot
Hi Willem, [auto build test WARNING on net-next/master] url: https://github.com/0day-ci/linux/commits/Willem-de-Bruijn/vhost_net-do-not-stall-on-zerocopy-depletion/20171001-054709 reproduce: # apt-get install sparse make ARCH=x86_64 allmodconfig make C=1 CF=-D__CHECK_E

Re: [PATCH net-next] vhost_net: do not stall on zerocopy depletion

2017-09-30 Thread kbuild test robot
Hi Willem, [auto build test WARNING on net-next/master] url: https://github.com/0day-ci/linux/commits/Willem-de-Bruijn/vhost_net-do-not-stall-on-zerocopy-depletion/20171001-054709 config: tile-allyesconfig (attached as .config) compiler: tilegx-linux-gcc (GCC) 4.6.2 reproduce: wget h

Re: [PATCH net-next] vhost_net: do not stall on zerocopy depletion

2017-09-30 Thread kbuild test robot
Hi Willem, [auto build test WARNING on net-next/master] url: https://github.com/0day-ci/linux/commits/Willem-de-Bruijn/vhost_net-do-not-stall-on-zerocopy-depletion/20171001-054709 config: x86_64-randconfig-x002-201740 (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 repro

Re: [PATCH net-next] vhost_net: do not stall on zerocopy depletion

2017-09-29 Thread Willem de Bruijn
On Fri, Sep 29, 2017 at 3:38 PM, Michael S. Tsirkin wrote: > On Wed, Sep 27, 2017 at 08:25:56PM -0400, Willem de Bruijn wrote: >> From: Willem de Bruijn >> >> Vhost-net has a hard limit on the number of zerocopy skbs in flight. >> When reached, transmission stalls. Stalls cause latency, as well a

Re: [PATCH net-next] vhost_net: do not stall on zerocopy depletion

2017-09-29 Thread Michael S. Tsirkin
On Wed, Sep 27, 2017 at 08:25:56PM -0400, Willem de Bruijn wrote: > From: Willem de Bruijn > > Vhost-net has a hard limit on the number of zerocopy skbs in flight. > When reached, transmission stalls. Stalls cause latency, as well as > head-of-line blocking of other flows that do not use zerocopy

Re: [PATCH net-next] vhost_net: do not stall on zerocopy depletion

2017-09-28 Thread Willem de Bruijn
On Thu, Sep 28, 2017 at 3:41 AM, Jason Wang wrote: > > > On 2017年09月28日 08:25, Willem de Bruijn wrote: >> >> From: Willem de Bruijn >> >> Vhost-net has a hard limit on the number of zerocopy skbs in flight. >> When reached, transmission stalls. Stalls cause latency, as well as >> head-of-line blo

Re: [PATCH net-next] vhost_net: do not stall on zerocopy depletion

2017-09-28 Thread Jason Wang
On 2017年09月28日 08:25, Willem de Bruijn wrote: From: Willem de Bruijn Vhost-net has a hard limit on the number of zerocopy skbs in flight. When reached, transmission stalls. Stalls cause latency, as well as head-of-line blocking of other flows that do not use zerocopy. Instead of stalling, re

Re: [PATCH net-next] vhost_net: do not stall on zerocopy depletion

2017-09-27 Thread Willem de Bruijn
On Wed, Sep 27, 2017 at 8:25 PM, Willem de Bruijn wrote: > From: Willem de Bruijn > > Vhost-net has a hard limit on the number of zerocopy skbs in flight. > When reached, transmission stalls. Stalls cause latency, as well as > head-of-line blocking of other flows that do not use zerocopy. > > Ins

[PATCH net-next] vhost_net: do not stall on zerocopy depletion

2017-09-27 Thread Willem de Bruijn
From: Willem de Bruijn Vhost-net has a hard limit on the number of zerocopy skbs in flight. When reached, transmission stalls. Stalls cause latency, as well as head-of-line blocking of other flows that do not use zerocopy. Instead of stalling, revert to copy-based transmission. Tested by sendin