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SubjectRe: [patch] voluntary-preempt-

* Lee Revell <> wrote:

> This is an extreme load situation, so I don't think it will be a
> real-world problem. I have not seen it under any normal workload.

well, 9 msecs is still not nice. I've been able to trigger larger than
10msec latencies too on a 2 GHz box.

> What about this one:
> This appears during normal use.

hm, tcp_collapse() in net/ipv4/tcp_input.c. Could you try to just return
from that function? Collapsing skbs of a given socket is not a
necessary functionality (it is only a 'nice' thing to have in OOM
situations) and it indeed can introduce quite high latencies.

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