On Sun, 10 Jul 2016 15:50:10 -0500
Tom Herbert wrote:
> > This particular patch in the series is meant to be standalone exactly
> > for this reason. I don't pretend to assert that this optimization will
> > work for everybody, or even for a future version of me with different
> > hardware. But, i
> This particular patch in the series is meant to be standalone exactly
> for this reason. I don't pretend to assert that this optimization will
> work for everybody, or even for a future version of me with different
> hardware. But, it passes my internal criteria for usefulness:
> 1. It provides a
On Fri, Jul 8, 2016 at 11:49 AM, Brenden Blanco wrote:
> On Fri, Jul 08, 2016 at 08:56:45AM +0200, Eric Dumazet wrote:
>> On Thu, 2016-07-07 at 21:16 -0700, Alexei Starovoitov wrote:
>>
>> > I've tried this style of prefetching in the past for normal stack
>> > and it didn't help at all.
>>
>> Thi
On Fri, Jul 08, 2016 at 08:56:45AM +0200, Eric Dumazet wrote:
> On Thu, 2016-07-07 at 21:16 -0700, Alexei Starovoitov wrote:
>
> > I've tried this style of prefetching in the past for normal stack
> > and it didn't help at all.
>
> This is very nice, but my experience showed opposite numbers.
> S
On Fri, 08 Jul 2016 05:56:31 +0200
Eric Dumazet wrote:
> On Thu, 2016-07-07 at 19:15 -0700, Brenden Blanco wrote:
> > XDP programs read and/or write packet data very early, and cache miss is
> > seen to be a bottleneck.
> >
> > Add prefetch logic in the xdp case 3 packets in the future. Throughp
On Thu, 2016-07-07 at 21:16 -0700, Alexei Starovoitov wrote:
> I've tried this style of prefetching in the past for normal stack
> and it didn't help at all.
This is very nice, but my experience showed opposite numbers.
So I guess you did not choose the proper prefetch strategy.
prefetching in m
On Fri, Jul 08, 2016 at 05:56:31AM +0200, Eric Dumazet wrote:
> On Thu, 2016-07-07 at 19:15 -0700, Brenden Blanco wrote:
> > XDP programs read and/or write packet data very early, and cache miss is
> > seen to be a bottleneck.
> >
> > Add prefetch logic in the xdp case 3 packets in the future. Thr
On Thu, 2016-07-07 at 19:15 -0700, Brenden Blanco wrote:
> XDP programs read and/or write packet data very early, and cache miss is
> seen to be a bottleneck.
>
> Add prefetch logic in the xdp case 3 packets in the future. Throughput
> improved from 10Mpps to 12.5Mpps. LLC misses as reported by p
XDP programs read and/or write packet data very early, and cache miss is
seen to be a bottleneck.
Add prefetch logic in the xdp case 3 packets in the future. Throughput
improved from 10Mpps to 12.5Mpps. LLC misses as reported by perf stat
reduced from ~14% to ~7%. Prefetch values of 0 through 5
