search for: tx_can_busy_poll

..._DESC(experimental_zcopytx, "Enable Zero Copy TX;" > " 1 -Enable; 0 - Disable"); > > @@ -287,12 +289,23 @@ static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) > rcu_read_unlock_bh(); > } > > +static bool tx_can_busy_poll(struct vhost_dev *dev, > + unsigned long endtime) > +{ > + unsigned long now = local_clock() >> 10; local_clock might go backwards if we jump between CPUs. One way to fix would be to record the CPU id and break out of loop if that changes. Also - defer this until we actually...

..._DESC(experimental_zcopytx, "Enable Zero Copy TX;" > " 1 -Enable; 0 - Disable"); > > @@ -287,12 +289,23 @@ static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) > rcu_read_unlock_bh(); > } > > +static bool tx_can_busy_poll(struct vhost_dev *dev, > + unsigned long endtime) > +{ > + unsigned long now = local_clock() >> 10; local_clock might go backwards if we jump between CPUs. One way to fix would be to record the CPU id and break out of loop if that changes. Also - defer this until we actually...

This path introduces a helper which can give a hint for whether or not there's a work queued in the work list. Signed-off-by: Jason Wang <jasowang at redhat.com> --- drivers/vhost/vhost.c | 6 ++++++ drivers/vhost/vhost.h | 1 + 2 files changed, 7 insertions(+) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index eec2f11..d42d11e 100644 --- a/drivers/vhost/vhost.c +++

This path introduces a helper which can give a hint for whether or not there's a work queued in the work list. Signed-off-by: Jason Wang <jasowang at redhat.com> --- drivers/vhost/vhost.c | 6 ++++++ drivers/vhost/vhost.h | 1 + 2 files changed, 7 insertions(+) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index eec2f11..d42d11e 100644 --- a/drivers/vhost/vhost.c +++

...p_timeout, int, 0444); MODULE_PARM_DESC(experimental_zcopytx, "Enable Zero Copy TX;" " 1 -Enable; 0 - Disable"); @@ -287,12 +289,23 @@ static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) rcu_read_unlock_bh(); } +static bool tx_can_busy_poll(struct vhost_dev *dev, + unsigned long endtime) +{ + unsigned long now = local_clock() >> 10; + + return busyloop_timeout && !need_resched() && + !time_after(now, endtime) && !vhost_has_work(dev) && + single_task_running(); +} + /* Expects...

..."Enable Zero Copy TX;" >> " 1 -Enable; 0 - Disable"); >> >> @@ -287,12 +289,23 @@ static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) >> rcu_read_unlock_bh(); >> } >> >> +static bool tx_can_busy_poll(struct vhost_dev *dev, >> + unsigned long endtime) >> +{ >> + unsigned long now = local_clock() >> 10; > local_clock might go backwards if we jump between CPUs. > One way to fix would be to record the CPU id and break > out of loop if that changes. Right, or...

Hi all: This series tries to add basic busy polling for vhost net. The idea is simple: at the end of tx 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 through module parameter. Test were done through: - 50 us as busy loop timeout - Netperf 2.6 - Two machines with back to back

Hi all: This series tries to add basic busy polling for vhost net. The idea is simple: at the end of tx 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 through module parameter. Test were done through: - 50 us as busy loop timeout - Netperf 2.6 - Two machines with back to back