On Mon, 2016-11-21 at 14:01 -0800, Eric Dumazet wrote:
> Tested-by: Paolo Abeni
>
> Thanks Paolo
>
> Note that udp6_recvmsg() hits the 3rd cache line of skb to access
> skb->protocol :
>
> is_udp4 = (skb->protocol == htons(ETH_P_IP));
>
> We might some trick to avoid this cache line miss.
Arg
On Mon, 2016-11-21 at 22:36 +0100, Paolo Abeni wrote:
> Nice catch, thank you Eric!
>
> This gives up to 8% speed-up in my performance test (wire speed udp flood
> with small packets)
>
> Tested-by: Paolo Abeni
Thanks Paolo
Note that udp6_recvmsg() hits the 3rd cache line of skb to access
skb
On Fri, 2016-11-18 at 17:18 -0800, Eric Dumazet wrote:
> From: Eric Dumazet
>
> UDP_SKB_CB(skb)->partial_cov is located at offset 66 in skb,
> requesting a cold cache line being read in cpu cache.
>
> We can avoid this cache line miss for UDP sockets,
> as partial_cov has a meaning only for UDPL
From: Eric Dumazet
Date: Fri, 18 Nov 2016 17:18:03 -0800
> From: Eric Dumazet
>
> UDP_SKB_CB(skb)->partial_cov is located at offset 66 in skb,
> requesting a cold cache line being read in cpu cache.
>
> We can avoid this cache line miss for UDP sockets,
> as partial_cov has a meaning only for
From: Eric Dumazet
UDP_SKB_CB(skb)->partial_cov is located at offset 66 in skb,
requesting a cold cache line being read in cpu cache.
We can avoid this cache line miss for UDP sockets,
as partial_cov has a meaning only for UDPLite.
Signed-off-by: Eric Dumazet
---
net/ipv4/udp.c |3 ++-
ne
