similar to: Re: Is fallback vhost_net to qemu for live migrate available？

On 08/31/2013 12:45 PM, Qin Chuanyu wrote: > On 2013/8/30 0:08, Anthony Liguori wrote: >> Hi Qin, > >>> By change the memory copy and notify mechanism ，currently >>> virtio-net with >>> vhost_net could run on Xen with good performance。 >> >> I think the key in doing this would be to implement a property >> ioeventfd and irqfd interface in

Vhost_net was known to suffer from HOL[1] issues which is not easy to fix. Several downstream disable the feature by default. What's more, the datapath was split and datacopy path got the support of batching and XDP support recently which makes it faster than zerocopy part for small packets transmission. It looks to me that disable zerocopy by default is more appropriate. It cold be enabled

On Wed, Feb 26, 2014 at 03:11:21PM +0800, Jason Wang wrote: > On 02/26/2014 02:32 PM, Qin Chuanyu wrote: > >On 2014/2/26 13:53, Jason Wang wrote: > >>On 02/25/2014 09:57 PM, Michael S. Tsirkin wrote: > >>>On Tue, Feb 25, 2014 at 02:53:58PM +0800, Jason Wang wrote: > >>>>We used to stop the handling of tx when the number of pending DMAs >

The only time when granted pages need to be treated specially is when using Xen''s PTE modification for grant mappings owned by another domain. Otherwise, the area does not require VM_DONTCOPY and VM_PFNMAP, since it can be accessed just like any other page of RAM. Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> --- drivers/xen/gntalloc.c | 14 ++++++++++++--

On Wed, Feb 12, 2014 at 03:38:18PM +0800, Qin Chuanyu wrote: > another question is that vhost_zerocopy_callback is called by kfree_skb, > it may called in different thread context. > vhost_poll_queue is called decided by ubufs->kref.refcount, this may > cause there isn't any thread call vhost_poll_queue, but at least > one is needed. and this cause network break. > We

On 02/12/2014 03:38 PM, Qin Chuanyu wrote: > On 2013/8/30 12:29, Jason Wang wrote: >> We used to poll vhost queue before making DMA is done, this is racy >> if vhost >> thread were waked up before marking DMA is done which can result the >> signal to >> be missed. Fix this by always poll the vhost thread before DMA is done. >> >> Signed-off-by: Jason

From: Jason Wang <jasowang at redhat.com> Date: Fri, 7 Mar 2014 13:28:27 +0800 > This is because the delay added by htb may lead the delay the finish > of DMAs and cause the pending DMAs for tap0 exceeds the limit > (VHOST_MAX_PEND). In this case vhost stop handling tx request until > htb send some packets. The problem here is all of the packets > transmission were blocked

SCHOOL OF COMPUTING University of Teesside Fully funded University Ph.D. studentship (3 years) Ref: QinOCT11 Applications are invited for a Ph.D. student to work on program analysis and software verification or a closely related topic under the supervision of Dr. Shengchao Qin in the School of Computing in Teesside University. Dr. Qin currently has a number of postdoc and Ph.D students in his

On 02/26/2014 05:23 PM, Michael S. Tsirkin wrote: > On Wed, Feb 26, 2014 at 03:11:21PM +0800, Jason Wang wrote: >> > On 02/26/2014 02:32 PM, Qin Chuanyu wrote: >>> > >On 2014/2/26 13:53, Jason Wang wrote: >>>> > >>On 02/25/2014 09:57 PM, Michael S. Tsirkin wrote: >>>>> > >>>On Tue, Feb 25, 2014 at 02:53:58PM +0800, Jason

On 02/26/2014 05:23 PM, Michael S. Tsirkin wrote: > On Wed, Feb 26, 2014 at 03:11:21PM +0800, Jason Wang wrote: >> > On 02/26/2014 02:32 PM, Qin Chuanyu wrote: >>> > >On 2014/2/26 13:53, Jason Wang wrote: >>>> > >>On 02/25/2014 09:57 PM, Michael S. Tsirkin wrote: >>>>> > >>>On Tue, Feb 25, 2014 at 02:53:58PM +0800, Jason

LLVM3.8 version. https://bugs.llvm.org//show_bug.cgi?id=24233. The example can catch exception. But I use my own code for testing, CustomEHMemoryManager allocated memory address is very large, allocateCodeSection, allocateDataSection assigned address (more than 32 bit address space) is getting smaller and smaller. Cause registerEHFrames to fail. 3.9.1 or 4.0.0 version has been supported on win

From: Jason Wang <jasowang at redhat.com> [ Upstream commit 098eadce3c622c07b328d0a43dda379b38cf7c5e ] Vhost_net was known to suffer from HOL[1] issues which is not easy to fix. Several downstream disable the feature by default. What's more, the datapath was split and datacopy path got the support of batching and XDP support recently which makes it faster than zerocopy part for small

From: Jason Wang <jasowang at redhat.com> [ Upstream commit 098eadce3c622c07b328d0a43dda379b38cf7c5e ] Vhost_net was known to suffer from HOL[1] issues which is not easy to fix. Several downstream disable the feature by default. What's more, the datapath was split and datacopy path got the support of batching and XDP support recently which makes it faster than zerocopy part for small

From: Jason Wang <jasowang at redhat.com> [ Upstream commit 098eadce3c622c07b328d0a43dda379b38cf7c5e ] Vhost_net was known to suffer from HOL[1] issues which is not easy to fix. Several downstream disable the feature by default. What's more, the datapath was split and datacopy path got the support of batching and XDP support recently which makes it faster than zerocopy part for small

From: Jason Wang <jasowang at redhat.com> [ Upstream commit 098eadce3c622c07b328d0a43dda379b38cf7c5e ] Vhost_net was known to suffer from HOL[1] issues which is not easy to fix. Several downstream disable the feature by default. What's more, the datapath was split and datacopy path got the support of batching and XDP support recently which makes it faster than zerocopy part for small

From: Jason Wang <jasowang at redhat.com> [ Upstream commit 098eadce3c622c07b328d0a43dda379b38cf7c5e ] Vhost_net was known to suffer from HOL[1] issues which is not easy to fix. Several downstream disable the feature by default. What's more, the datapath was split and datacopy path got the support of batching and XDP support recently which makes it faster than zerocopy part for small

From: Jason Wang <jasowang at redhat.com> [ Upstream commit 098eadce3c622c07b328d0a43dda379b38cf7c5e ] Vhost_net was known to suffer from HOL[1] issues which is not easy to fix. Several downstream disable the feature by default. What's more, the datapath was split and datacopy path got the support of batching and XDP support recently which makes it faster than zerocopy part for small

On 2018?07?02? 12:37, Toshiaki Makita wrote: > On 2018/07/02 11:54, Jason Wang wrote: >> On 2018?07?02? 10:45, Toshiaki Makita wrote: >>> Hi Jason, >>> >>> On 2018/06/29 18:30, Jason Wang wrote: >>>> On 2018?06?29? 16:09, Toshiaki Makita wrote: >>> ... >>>>> To fix this, poll the work instead of enabling notification when

Hi all, I'm wanting to make weekly backups of host qin to host elijah. I set a crontab to run a script that effectually executes this rsync command: rsync -ave ssh --exclude-from=excludes.txt --delete / elijah:/home/backup/qin host qin is running gentoo linux with rsync version 2.5.6. host elijah is running debian linux (stable) with rsync version 2.5.7. the excludes.txt file looks like

On 2018?07?02? 15:11, Toshiaki Makita wrote: > On 2018/07/02 15:17, Jason Wang wrote: >> On 2018?07?02? 12:37, Toshiaki Makita wrote: >>> On 2018/07/02 11:54, Jason Wang wrote: >>>> On 2018?07?02? 10:45, Toshiaki Makita wrote: >>>>> Hi Jason, >>>>> >>>>> On 2018/06/29 18:30, Jason Wang wrote: >>>>>> On