Messages in this thread | | | Date | Thu, 08 Apr 2010 00:05:57 -0700 (PDT) | Subject | Re: hackbench regression due to commit 9dfc6e68bfe6e | From | David Miller <> |
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From: Eric Dumazet <eric.dumazet@gmail.com> Date: Thu, 08 Apr 2010 09:00:19 +0200
> If run individually, the tests results are more what we would expect > (slow), but if machine runs the two set of process concurrently, each > group runs much faster...
BTW, I just discovered (thanks to the function graph tracer, woo hoo!) that loopback TCP packets get fully checksum validated on receive.
I'm trying to figure out why skb->ip_summed ends up being CHECKSUM_NONE in tcp_v4_rcv() even though it gets set to CHECKSUM_PARTIAL in tcp_sendmsg().
I wonder how much this accounts for some of the hackbench oddities... and other regressions in loopback tests we've seen. :-)
Just FYI...
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