similar to: repost: af_packet vs virtio (was packed ring layout proposal v2)

On Tue, Aug 01, 2017 at 08:54:27PM -0700, Steven Luong wrote: > * Descriptor ring: > > Guest adds descriptors with unique index values and DESC_HW set in flags. > Host overwrites used descriptors with correct len, index, and DESC_HW > clear.? Flags are always set/cleared last. > > #define DESC_HW 0x0080 > > struct desc { > ? ? ? ? __le64

On Tue, Aug 01, 2017 at 08:54:27PM -0700, Steven Luong wrote: > * Descriptor ring: > > Guest adds descriptors with unique index values and DESC_HW set in flags. > Host overwrites used descriptors with correct len, index, and DESC_HW > clear.? Flags are always set/cleared last. > > #define DESC_HW 0x0080 > > struct desc { > ? ? ? ? __le64

On Sun, Jul 16, 2017 at 06:00:45AM +0000, Lior Narkis wrote: > > -----Original Message----- > > From: virtio-dev at lists.oasis-open.org [mailto:virtio-dev at lists.oasis-open.org] > > On Behalf Of Michael S. Tsirkin > > Sent: Wednesday, February 08, 2017 5:20 AM > > To: virtio-dev at lists.oasis-open.org > > Cc: virtualization at lists.linux-foundation.org >

> -----Original Message----- > From: virtio-dev at lists.oasis-open.org [mailto:virtio-dev at lists.oasis-open.org] > On Behalf Of Michael S. Tsirkin > Sent: Wednesday, February 08, 2017 5:20 AM > To: virtio-dev at lists.oasis-open.org > Cc: virtualization at lists.linux-foundation.org > Subject: [virtio-dev] packed ring layout proposal v2 > > This is an update from v1

> -----Original Message----- > From: Michael S. Tsirkin [mailto:mst at redhat.com] > Sent: Tuesday, July 18, 2017 7:23 PM > To: Lior Narkis <liorn at mellanox.com> > Cc: virtio-dev at lists.oasis-open.org; virtualization at lists.linux-foundation.org > Subject: Re: [virtio-dev] packed ring layout proposal v2 > > On Sun, Jul 16, 2017 at 06:00:45AM +0000, Lior Narkis

> -----Original Message----- > From: Michael S. Tsirkin [mailto:mst at redhat.com] > Sent: Tuesday, July 18, 2017 7:23 PM > To: Lior Narkis <liorn at mellanox.com> > Cc: virtio-dev at lists.oasis-open.org; virtualization at lists.linux-foundation.org > Subject: Re: [virtio-dev] packed ring layout proposal v2 > > On Sun, Jul 16, 2017 at 06:00:45AM +0000, Lior Narkis

On Wed, Mar 01, 2017 at 11:57:15AM +0800, Yuanhan Liu wrote: > On Wed, Mar 01, 2017 at 03:02:29AM +0200, Michael S. Tsirkin wrote: > > > > * Descriptor ring: > > > > > > > > Guest adds descriptors with unique index values and DESC_HW set in flags. > > > > Host overwrites used descriptors with correct len, index, and DESC_HW > > > >

On Wed, Mar 01, 2017 at 03:02:29AM +0200, Michael S. Tsirkin wrote: > > > * Descriptor ring: > > > > > > Guest adds descriptors with unique index values and DESC_HW set in flags. > > > Host overwrites used descriptors with correct len, index, and DESC_HW > > > clear. Flags are always set/cleared last. > > > > May I know what's the

On Tue, Feb 28, 2017 at 01:02:18PM +0800, Yuanhan Liu wrote: > On Wed, Feb 08, 2017 at 05:20:14AM +0200, Michael S. Tsirkin wrote: > > This is an update from v1 version. > > Changes: > > - update event suppression mechanism > > - separate options for indirect and direct s/g > > - lots of new features > > > > --- > > > > Performance

On Tue, Feb 28, 2017 at 01:02:18PM +0800, Yuanhan Liu wrote: > On Wed, Feb 08, 2017 at 05:20:14AM +0200, Michael S. Tsirkin wrote: > > This is an update from v1 version. > > Changes: > > - update event suppression mechanism > > - separate options for indirect and direct s/g > > - lots of new features > > > > --- > > > > Performance

This is an update from v1 version. Changes: - update event suppression mechanism - separate options for indirect and direct s/g - lots of new features --- Performance analysis of this is in my kvm forum 2016 presentation. The idea is to have a r/w descriptor in a ring structure, replacing the used and available ring, index and descriptor buffer. * Descriptor ring: Guest adds descriptors with

This is an update from v1 version. Changes: - update event suppression mechanism - separate options for indirect and direct s/g - lots of new features --- Performance analysis of this is in my kvm forum 2016 presentation. The idea is to have a r/w descriptor in a ring structure, replacing the used and available ring, index and descriptor buffer. * Descriptor ring: Guest adds descriptors with

On 02/08/2017 04:20 AM, Michael S. Tsirkin wrote: [...] > * Prototype > > A partial prototype can be found under > tools/virtio/ringtest/ring.c > > Test run: > [mst at tuck ringtest]$ time ./ring > real 0m0.399s > user 0m0.791s > sys 0m0.000s > [mst at tuck ringtest]$ time ./virtio_ring_0_9 > real 0m0.503s > user 0m0.999s > sys

On Wed, Feb 08, 2017 at 02:37:57PM +0100, Christian Borntraeger wrote: > On 02/08/2017 04:20 AM, Michael S. Tsirkin wrote: > [...] > > * Prototype > > > > A partial prototype can be found under > > tools/virtio/ringtest/ring.c > > > > Test run: > > [mst at tuck ringtest]$ time ./ring > > real 0m0.399s > > user 0m0.791s > >

On Wed, Feb 08, 2017 at 02:37:57PM +0100, Christian Borntraeger wrote: > On 02/08/2017 04:20 AM, Michael S. Tsirkin wrote: > [...] > > * Prototype > > > > A partial prototype can be found under > > tools/virtio/ringtest/ring.c > > > > Test run: > > [mst at tuck ringtest]$ time ./ring > > real 0m0.399s > > user 0m0.791s > >

On 2017?09?10? 13:06, Michael S. Tsirkin wrote: > This is an update from v2 version. > Changes: > - update event suppression mechanism > - add wrap counter: DESC_WRAP flag in addition to > DESC_DRIVER flag used for validity so device does not have to > write out all used descriptors. Do we have benchmark result to show the advantage of DESC_DRIVER over e.g avail/used

Hi Michael, > -----Original Message----- > From: virtio-dev at lists.oasis-open.org [mailto:virtio-dev at lists.oasis-open.org] > On Behalf Of Michael S. Tsirkin > Sent: Sunday, September 10, 2017 1:06 PM > To: virtio-dev at lists.oasis-open.org > Cc: virtualization at lists.linux-foundation.org > Subject: [virtio-dev] packed ring layout proposal v3 > [...] > *

This adds micro-benchmarks useful for tuning virtio ring layouts. Three layouts are currently implemented: - virtio 0.9 compatible one - an experimental extension bypassing the ring index, polling ring itself instead - an experimental extension bypassing avail and used ring completely Typical use: sh run-on-all.sh perf stat -r 10 --log-fd 1 -- ./ring It doesn't depend on the kernel

This adds micro-benchmarks useful for tuning virtio ring layouts. Three layouts are currently implemented: - virtio 0.9 compatible one - an experimental extension bypassing the ring index, polling ring itself instead - an experimental extension bypassing avail and used ring completely Typical use: sh run-on-all.sh perf stat -r 10 --log-fd 1 -- ./ring It doesn't depend on the kernel

> -----Original Message----- > From: virtio-dev at lists.oasis-open.org [mailto:virtio-dev at lists.oasis-open.org] > On Behalf Of Michael S. Tsirkin > Sent: Wednesday, October 4, 2017 8:58 PM > To: Jens Freimann <jfreimann at redhat.com> > Cc: Liang, Cunming <cunming.liang at intel.com>; Steven Luong (sluong) > <sluong at cisco.com>; virtio-dev at