Re: [PATCH] x86: Run checksumming in parallel accross multiple alu's

[Eric Dumazet]

On Tue, 2013-10-15 at 07:26 -0700, Eric Dumazet wrote:

> And the receiver should also do the same : (ethtool -K eth0 rx off)
> 
>     10.55%    netserver  [kernel.kallsyms]  [k]
> csum_partial_copy_generic            

I get the csum_partial() if disabling prequeue.

echo 1 >/proc/sys/net/ipv4/tcp_low_latency

    24.49%      swapper  [kernel.kallsyms]  [k]
csum_partial                        
                |
                --- csum_partial
                    skb_checksum
                    __skb_checksum_complete_head
                    __skb_checksum_complete
                    tcp_rcv_established
                    tcp_v4_do_rcv
                    tcp_v4_rcv
                    ip_local_deliver_finish
                    ip_local_deliver
                    ip_rcv_finish
                    ip_rcv

So yes, we can call csum_partial() in receive path in this case.



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