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...vq->num, by testing the min() of both explicitly. See also the >> discussion in the second link below. >> >> Link:http://lkml.kernel.org/r/CAF=yD-+Wk9sc9dXMUq1+x_hh=3ThTXa6BnZkygP3tgVpjbp93g at mail.gmail.com >> Link:http://lkml.kernel.org/r/20170819064129.27272-1-den at klaipeden.com >> Signed-off-by: Willem de Bruijn <willemb at google.com> > > I'd like to see the effect on the non rate limited case though. > If guest is quick won't we have lots of copies then? Yes, but not significantly more than without this patch. I ran 1, 10 and 100 flow...

...vq->num, by testing the min() of both explicitly. See also the >> discussion in the second link below. >> >> Link:http://lkml.kernel.org/r/CAF=yD-+Wk9sc9dXMUq1+x_hh=3ThTXa6BnZkygP3tgVpjbp93g at mail.gmail.com >> Link:http://lkml.kernel.org/r/20170819064129.27272-1-den at klaipeden.com >> Signed-off-by: Willem de Bruijn <willemb at google.com> > > I'd like to see the effect on the non rate limited case though. > If guest is quick won't we have lots of copies then? Yes, but not significantly more than without this patch. I ran 1, 10 and 100 flow...

...discussion in the second link below. Changes v1 -> v2 - replaced min with typed min_t - avoid unnecessary whitespace change Link:http://lkml.kernel.org/r/CAF=yD-+Wk9sc9dXMUq1+x_hh=3ThTXa6BnZkygP3tgVpjbp93g at mail.gmail.com Link:http://lkml.kernel.org/r/20170819064129.27272-1-den at klaipeden.com Signed-off-by: Willem de Bruijn <willemb at google.com> --- drivers/vhost/net.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index 58585ec8699e..68677d930e20 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost...

...discussion in the second link below. Changes v1 -> v2 - replaced min with typed min_t - avoid unnecessary whitespace change Link:http://lkml.kernel.org/r/CAF=yD-+Wk9sc9dXMUq1+x_hh=3ThTXa6BnZkygP3tgVpjbp93g at mail.gmail.com Link:http://lkml.kernel.org/r/20170819064129.27272-1-den at klaipeden.com Signed-off-by: Willem de Bruijn <willemb at google.com> --- drivers/vhost/net.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index 58585ec8699e..68677d930e20 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost...

...ess also for much smaller values of vq->num, by testing the min() of both explicitly. See also the discussion in the second link below. Link:http://lkml.kernel.org/r/CAF=yD-+Wk9sc9dXMUq1+x_hh=3ThTXa6BnZkygP3tgVpjbp93g at mail.gmail.com Link:http://lkml.kernel.org/r/20170819064129.27272-1-den at klaipeden.com Signed-off-by: Willem de Bruijn <willemb at google.com> --- drivers/vhost/net.c | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-) diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index 58585ec8699e..50758602ae9d 100644 --- a/drivers/vhost/net.c +++ b/drivers/vh...

...ess also for much smaller values of vq->num, by testing the min() of both explicitly. See also the discussion in the second link below. Link:http://lkml.kernel.org/r/CAF=yD-+Wk9sc9dXMUq1+x_hh=3ThTXa6BnZkygP3tgVpjbp93g at mail.gmail.com Link:http://lkml.kernel.org/r/20170819064129.27272-1-den at klaipeden.com Signed-off-by: Willem de Bruijn <willemb at google.com> --- drivers/vhost/net.c | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-) diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index 58585ec8699e..50758602ae9d 100644 --- a/drivers/vhost/net.c +++ b/drivers/vh...

...r values of > vq->num, by testing the min() of both explicitly. See also the > discussion in the second link below. > > Link:http://lkml.kernel.org/r/CAF=yD-+Wk9sc9dXMUq1+x_hh=3ThTXa6BnZkygP3tgVpjbp93g at mail.gmail.com > Link:http://lkml.kernel.org/r/20170819064129.27272-1-den at klaipeden.com > Signed-off-by: Willem de Bruijn <willemb at google.com> > --- > drivers/vhost/net.c | 14 ++++---------- > 1 file changed, 4 insertions(+), 10 deletions(-) > > diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c > index 58585ec8699e..50758602ae9d 100644 > -...

...values of > vq->num, by testing the min() of both explicitly. See also the > discussion in the second link below. > > Link:http://lkml.kernel.org/r/CAF=yD-+Wk9sc9dXMUq1+x_hh=3ThTXa6BnZkygP3tgVpjbp93g at mail.gmail.com > Link:http://lkml.kernel.org/r/20170819064129.27272-1-den at klaipeden.com > Signed-off-by: Willem de Bruijn <willemb at google.com> I'd like to see the effect on the non rate limited case though. If guest is quick won't we have lots of copies then? > --- > drivers/vhost/net.c | 14 ++++---------- > 1 file changed, 4 insertions(+), 10 del...

On Wed, 2017-07-26 at 19:08 +0300, Michael S. Tsirkin wrote: > On Wed, Jul 26, 2017 at 09:37:15PM +0800, Jason Wang wrote: > > > > > > On 2017?07?26? 21:18, Jason Wang wrote: > > > > > > > > > On 2017?07?26? 20:57, Michael S. Tsirkin wrote: > > > > On Wed, Jul 26, 2017 at 04:03:17PM +0800, Jason Wang wrote: > > > > >