Displaying 4 results from an estimated 4 matches for "vhost_zerocopy_signaled_us".
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vhost_zerocopy_signaled_used
2013 Aug 23
1
[PATCH 2/6] vhost_net: use vhost_add_used_and_signal_n() in vhost_zerocopy_signal_used()
...unnecessary signal to
> guest. I will do some test.
Have done some test. I can see 2% - 3% increasing in both aggregate
transaction rate and per cpu transaction rate in TCP_RR and UDP_RR test.
I'm using ixgbe. W/o this patch, I can see more than 100 calls of
vhost_add_used_signal() in one vhost_zerocopy_signaled_used(). This is
because ixgbe (and other modern ethernet driver) tends to free old tx
skbs in a loop during tx interrupt, and vhost tend to batch the adding
used and signal in vhost_zerocopy_callback(). Switching to use
vhost_add_use_and_signal_n() means saving 100 times of used idx updating
and memor...
2013 Aug 23
1
[PATCH 2/6] vhost_net: use vhost_add_used_and_signal_n() in vhost_zerocopy_signal_used()
...unnecessary signal to
> guest. I will do some test.
Have done some test. I can see 2% - 3% increasing in both aggregate
transaction rate and per cpu transaction rate in TCP_RR and UDP_RR test.
I'm using ixgbe. W/o this patch, I can see more than 100 calls of
vhost_add_used_signal() in one vhost_zerocopy_signaled_used(). This is
because ixgbe (and other modern ethernet driver) tends to free old tx
skbs in a loop during tx interrupt, and vhost tend to batch the adding
used and signal in vhost_zerocopy_callback(). Switching to use
vhost_add_use_and_signal_n() means saving 100 times of used idx updating
and memor...
2013 Aug 16
2
[PATCH 2/6] vhost_net: use vhost_add_used_and_signal_n() in vhost_zerocopy_signal_used()
On Fri, Aug 16, 2013 at 01:16:26PM +0800, Jason Wang wrote:
> Switch to use vhost_add_used_and_signal_n() to avoid multiple calls to
> vhost_add_used_and_signal(). With the patch we will call at most 2 times
> (consider done_idx warp around) compared to N times w/o this patch.
>
> Signed-off-by: Jason Wang <jasowang at redhat.com>
So? Does this help performance then?
>
2013 Aug 16
2
[PATCH 2/6] vhost_net: use vhost_add_used_and_signal_n() in vhost_zerocopy_signal_used()
On Fri, Aug 16, 2013 at 01:16:26PM +0800, Jason Wang wrote:
> Switch to use vhost_add_used_and_signal_n() to avoid multiple calls to
> vhost_add_used_and_signal(). With the patch we will call at most 2 times
> (consider done_idx warp around) compared to N times w/o this patch.
>
> Signed-off-by: Jason Wang <jasowang at redhat.com>
So? Does this help performance then?
>