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...++++++++++++++++++++++++--- > drivers/vhost/vhost.c | 14 ++++++++ > drivers/vhost/vhost.h | 1 + > include/uapi/linux/vhost.h | 6 ++++ > 4 files changed, 95 insertions(+), 5 deletions(-) > > diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c > index 9eda69e..c91af93 100644 > --- a/drivers/vhost/net.c > +++ b/drivers/vhost/net.c > @@ -287,6 +287,44 @@ static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) > rcu_read_unlock_bh(); > } > > +static inline unsigned long busy_clock(void) > +{ > + return local_clock()...

...++++++++++++++++++++++++--- > drivers/vhost/vhost.c | 14 ++++++++ > drivers/vhost/vhost.h | 1 + > include/uapi/linux/vhost.h | 6 ++++ > 4 files changed, 95 insertions(+), 5 deletions(-) > > diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c > index 9eda69e..c91af93 100644 > --- a/drivers/vhost/net.c > +++ b/drivers/vhost/net.c > @@ -287,6 +287,44 @@ static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) > rcu_read_unlock_bh(); > } > > +static inline unsigned long busy_clock(void) > +{ > + return local_clock()...

...++++++++++++++++++++++++--- > drivers/vhost/vhost.c | 14 ++++++++ > drivers/vhost/vhost.h | 1 + > include/uapi/linux/vhost.h | 6 ++++ > 4 files changed, 95 insertions(+), 5 deletions(-) > > diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c > index 9eda69e..c91af93 100644 > --- a/drivers/vhost/net.c > +++ b/drivers/vhost/net.c > @@ -287,6 +287,44 @@ static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) > rcu_read_unlock_bh(); > } > > +static inline unsigned long busy_clock(void) > +{ > + return local_clock()...

...++++++++++++++++++++++++--- > drivers/vhost/vhost.c | 14 ++++++++ > drivers/vhost/vhost.h | 1 + > include/uapi/linux/vhost.h | 6 ++++ > 4 files changed, 95 insertions(+), 5 deletions(-) > > diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c > index 9eda69e..c91af93 100644 > --- a/drivers/vhost/net.c > +++ b/drivers/vhost/net.c > @@ -287,6 +287,44 @@ static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) > rcu_read_unlock_bh(); > } > > +static inline unsigned long busy_clock(void) > +{ > + return local_clock()...

...c | 14 ++++++++ >> > drivers/vhost/vhost.h | 1 + >> > include/uapi/linux/vhost.h | 6 ++++ >> > 4 files changed, 95 insertions(+), 5 deletions(-) >> > >> > diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c >> > index 9eda69e..c91af93 100644 >> > --- a/drivers/vhost/net.c >> > +++ b/drivers/vhost/net.c >> > @@ -287,6 +287,44 @@ static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) >> > rcu_read_unlock_bh(); >> > } >> > >> > +static inline uns...

This series tries to add basic busy polling for vhost net. The idea is simple: at the end of tx/rx processing, busy polling for new tx added descriptor and rx receive socket for a while. The maximum number of time (in us) could be spent on busy polling was specified ioctl. Test A were done through: - 50 us as busy loop timeout - Netperf 2.6 - Two machines with back to back connected mlx4 - Guest

This series tries to add basic busy polling for vhost net. The idea is simple: at the end of tx/rx processing, busy polling for new tx added descriptor and rx receive socket for a while. The maximum number of time (in us) could be spent on busy polling was specified ioctl. Test A were done through: - 50 us as busy loop timeout - Netperf 2.6 - Two machines with back to back connected mlx4 - Guest

...t.c | 79 +++++++++++++++++++++++++++++++++++++++++++--- drivers/vhost/vhost.c | 14 ++++++++ drivers/vhost/vhost.h | 1 + include/uapi/linux/vhost.h | 6 ++++ 4 files changed, 95 insertions(+), 5 deletions(-) diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index 9eda69e..c91af93 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -287,6 +287,44 @@ static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) rcu_read_unlock_bh(); } +static inline unsigned long busy_clock(void) +{ + return local_clock() >> 10; +} + +static bool vhost_can_bus...