Re: TCP prequeue performance

[Andi Kleen]

"David S. Miller" <davem@xxxxxxxxxxxxx> writes:
>
> Not true, if this check does not pass, tp->ucopy.task is
> never set, therefore prequeue processing is never performed.

Oh well, here goes my nice theory :)
>
> This test must pass the first time, when both tp->ucopy.task
> and user_recv are both NULL, in order for prequeue processing
> to occur at all.
>
> So his change did totally disable prequeue.

Then probably his test was latency bound somehow, but normally
that should not affect system time, just wall time.

I would perhaps compare context switch numbers and netstat -s
output between the different runs and see if anything pops out.

-Andi
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