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...1 PM > To: Liu, Changpeng <changpeng.liu at intel.com> > Cc: virtualization at lists.linux-foundation.org; cavery at redhat.com; > jasowang at redhat.com; pbonzini at redhat.com; Wang, Wei W > <wei.w.wang at intel.com> > Subject: Re: [PATCH v4] virtio_blk: add DISCARD and WRIET ZEROES commands > support > > On Tue, May 29, 2018 at 09:42:24AM +0800, Changpeng Liu wrote: > > num = blk_rq_map_sg(hctx->queue, req, vbr->sg); > > if (num) { > > - if (rq_data_dir(req) == WRITE) > > + if (rq_data_dir(req) == WRITE || type == VIRTIO_BL...

...1 PM > To: Liu, Changpeng <changpeng.liu at intel.com> > Cc: virtualization at lists.linux-foundation.org; cavery at redhat.com; > jasowang at redhat.com; pbonzini at redhat.com; Wang, Wei W > <wei.w.wang at intel.com> > Subject: Re: [PATCH v4] virtio_blk: add DISCARD and WRIET ZEROES commands > support > > On Tue, May 29, 2018 at 09:42:24AM +0800, Changpeng Liu wrote: > > num = blk_rq_map_sg(hctx->queue, req, vbr->sg); > > if (num) { > > - if (rq_data_dir(req) == WRITE) > > + if (rq_data_dir(req) == WRITE || type == VIRTIO_BL...

...0 PM > To: Liu, Changpeng <changpeng.liu at intel.com> > Cc: virtualization at lists.linux-foundation.org; cavery at redhat.com; > jasowang at redhat.com; pbonzini at redhat.com; Wang, Wei W > <wei.w.wang at intel.com> > Subject: Re: [PATCH v4] virtio_blk: add DISCARD and WRIET ZEROES commands > support > > On Thu, May 31, 2018 at 11:53:26PM +0000, Liu, Changpeng wrote: > > > > > > > -----Original Message----- > > > From: Stefan Hajnoczi [mailto:stefanha at redhat.com] > > > Sent: Thursday, May 31, 2018 6:31 PM > > &g...

...0 PM > To: Liu, Changpeng <changpeng.liu at intel.com> > Cc: virtualization at lists.linux-foundation.org; cavery at redhat.com; > jasowang at redhat.com; pbonzini at redhat.com; Wang, Wei W > <wei.w.wang at intel.com> > Subject: Re: [PATCH v4] virtio_blk: add DISCARD and WRIET ZEROES commands > support > > On Thu, May 31, 2018 at 11:53:26PM +0000, Liu, Changpeng wrote: > > > > > > > -----Original Message----- > > > From: Stefan Hajnoczi [mailto:stefanha at redhat.com] > > > Sent: Thursday, May 31, 2018 6:31 PM > > &g...

...hangpeng <changpeng.liu at intel.com> > > Cc: virtualization at lists.linux-foundation.org; cavery at redhat.com; > > jasowang at redhat.com; pbonzini at redhat.com; Wang, Wei W > > <wei.w.wang at intel.com> > > Subject: Re: [PATCH v4] virtio_blk: add DISCARD and WRIET ZEROES commands > > support > > > > On Tue, May 29, 2018 at 09:42:24AM +0800, Changpeng Liu wrote: > > > num = blk_rq_map_sg(hctx->queue, req, vbr->sg); > > > if (num) { > > > - if (rq_data_dir(req) == WRITE) > > > + if (rq_data_dir...

On Tue, May 29, 2018 at 09:42:24AM +0800, Changpeng Liu wrote: > num = blk_rq_map_sg(hctx->queue, req, vbr->sg); > if (num) { > - if (rq_data_dir(req) == WRITE) > + if (rq_data_dir(req) == WRITE || type == VIRTIO_BLK_T_DISCARD || > + type == VIRTIO_BLK_T_WRITE_ZEROES) > vbr->out_hdr.type |= cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_OUT); The VIRTIO

On 04/06/2018 06:14, Liu, Changpeng wrote: >>> But I believe the specification says VIRTIO_BLK_T_OUT means direction, so >>> OR the two bits together should compliance with the specification. >> I cannot find that in the specification: >> >> http://docs.oasis-open.org/virtio/virtio/v1.0/cs04/virtio-v1.0-cs04.html#x1- >> 2020002 >> >> and it

...hangpeng <changpeng.liu at intel.com> > > Cc: virtualization at lists.linux-foundation.org; cavery at redhat.com; > > jasowang at redhat.com; pbonzini at redhat.com; Wang, Wei W > > <wei.w.wang at intel.com> > > Subject: Re: [PATCH v6] virtio_blk: add DISCARD and WRIET ZEROES commands > > support > > > > On Wed, Jun 06, 2018 at 12:19:00PM +0800, Changpeng Liu wrote: > > > Existing virtio-blk protocol doesn't have DISCARD/WRITE ZEROES commands > > > support, this will impact the performance when using SSD backend over >...

...0 PM > To: Liu, Changpeng <changpeng.liu at intel.com> > Cc: virtualization at lists.linux-foundation.org; cavery at redhat.com; > jasowang at redhat.com; pbonzini at redhat.com; Wang, Wei W > <wei.w.wang at intel.com> > Subject: Re: [PATCH v6] virtio_blk: add DISCARD and WRIET ZEROES commands > support > > On Thu, Jun 07, 2018 at 11:07:06PM +0000, Liu, Changpeng wrote: > > > > > > > -----Original Message----- > > > From: Stefan Hajnoczi [mailto:stefanha at redhat.com] > > > Sent: Thursday, June 7, 2018 9:10 PM > > &g...

On Wed, Jun 06, 2018 at 12:19:00PM +0800, Changpeng Liu wrote: > Existing virtio-blk protocol doesn't have DISCARD/WRITE ZEROES commands > support, this will impact the performance when using SSD backend over > file systems. > > Commit 88c85538 "virtio-blk: add discard and write zeroes features to > specification"(see https://github.com/oasis-tcs/virtio-spec)

...0 PM > To: Liu, Changpeng <changpeng.liu at intel.com> > Cc: virtualization at lists.linux-foundation.org; cavery at redhat.com; > jasowang at redhat.com; pbonzini at redhat.com; Wang, Wei W > <wei.w.wang at intel.com> > Subject: Re: [PATCH v6] virtio_blk: add DISCARD and WRIET ZEROES commands > support > > On Wed, Jun 06, 2018 at 12:19:00PM +0800, Changpeng Liu wrote: > > Existing virtio-blk protocol doesn't have DISCARD/WRITE ZEROES commands > > support, this will impact the performance when using SSD backend over > > file systems. > &...

...0 PM > To: Liu, Changpeng <changpeng.liu at intel.com> > Cc: virtualization at lists.linux-foundation.org; cavery at redhat.com; > jasowang at redhat.com; pbonzini at redhat.com; Wang, Wei W > <wei.w.wang at intel.com> > Subject: Re: [PATCH v6] virtio_blk: add DISCARD and WRIET ZEROES commands > support > > On Wed, Jun 06, 2018 at 12:19:00PM +0800, Changpeng Liu wrote: > > Existing virtio-blk protocol doesn't have DISCARD/WRITE ZEROES commands > > support, this will impact the performance when using SSD backend over > > file systems. > &...

On Fri, Mar 30, 2018 at 08:49:34AM +0800, Changpeng Liu wrote: > Existing virtio-blk protocol doesn't have DISCARD/WRITE ZEROES > command support, this will impact the performance when using SSD > backend over file systems. > > The idea here is using 16 Bytes payload as one descriptor for > DISCARD/WRITE ZEROES command, users can put several ranges into > one command, for

Existing virtio-blk protocol doesn't have DISCARD/WRITE ZEROES commands support, this will impact the performance when using SSD backend over file systems. Commit 88c85538 "virtio-blk: add discard and write zeroes features to specification"(see https://github.com/oasis-tcs/virtio-spec) extended existing virtio-blk protocol, adding extra DISCARD and WRITE ZEROES commands support.

Existing virtio-blk protocol doesn't have DISCARD/WRITE ZEROES commands support, this will impact the performance when using SSD backend over file systems. Commit 88c85538 "virtio-blk: add discard and write zeroes features to specification"(see https://github.com/oasis-tcs/virtio-spec) extended existing virtio-blk protocol, adding extra DISCARD and WRITE ZEROES commands support.

Existing virtio-blk protocol doesn't have DISCARD/WRITE ZEROES commands support, this will impact the performance when using SSD backend over file systems. Commit 88c85538 "virtio-blk: add discard and write zeroes features to specification"(see https://github.com/oasis-tcs/virtio-spec) extended existing virtio-blk protocol, adding extra DISCARD and WRITE ZEROES commands support.

Existing virtio-blk protocol doesn't have DISCARD/WRITE ZEROES commands support, this will impact the performance when using SSD backend over file systems. Commit 88c85538 "virtio-blk: add discard and write zeroes features to specification"(see https://github.com/oasis-tcs/virtio-spec) extended existing virtio-blk protocol, adding extra DISCARD and WRITE ZEROES commands support.

...work as gateway between PSTN and VoIP network. I think about 1000 SIP users accounts and 4 E1 ports. I know that preformance in this case depend on codeck which will be use. I want use card with CAPI interface. Can you describe me your experience with this? If you have some big installaion, please wriete some info about server (procesor, ram etc), numbers of user and simultaneous calls beetwene VoIP and PSTN. How often server crash? Regards Doki

Existing virtio-blk protocol doesn't have DISCARD/WRITE ZEROES command support, this will impact the performance when using SSD backend over file systems. The idea here is using 16 Bytes payload as one descriptor for DISCARD/WRITE ZEROES command, users can put several ranges into one command, for the purpose to support such feature, two feature flags

Existing virtio-blk protocol doesn't have DISCARD/WRITE ZEROES command support, this will impact the performance when using SSD backend over file systems. The idea here is using 16 Bytes payload as one descriptor for DISCARD/WRITE ZEROES command, users can put several ranges into one command, for the purpose to support such feature, two feature flags