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.... This value happens to correspond to VHOST_MAX_PENDING for vq->num == 256. Allow smaller fractions and ensure correctness 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/drive...

.... This value happens to correspond to VHOST_MAX_PENDING for vq->num == 256. Allow smaller fractions and ensure correctness 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/drive...

...MAX_PENDING for vq->num == 256. Allow smaller >> fractions and ensure correctness 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> > > I'd like to see the effect on the non rate limited case though. > If guest is q...

...MAX_PENDING for vq->num == 256. Allow smaller >> fractions and ensure correctness 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> > > I'd like to see the effect on the non rate limited case though. > If guest is q...

...s and ensure correctness also for much smaller values of vq->num, by testing the min() of both explicitly. See also the 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/...

...s and ensure correctness also for much smaller values of vq->num, by testing the min() of both explicitly. See also the 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/...

...Have you tested e.g vq->num = 512 or 1024? > Allow smaller > fractions and ensure correctness 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 delet...

...orrespond to VHOST_MAX_PENDING for vq->num == 256. Allow smaller > fractions and ensure correctness 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> I'd like to see the effect on the non rate limited case though. If guest is quick won't we have...