Re: [patch] entry.S fix. [was: Re: scheduling problem?]

William Montgomery (william@opinicus.com)
Fri, 17 Dec 1999 14:52:38 -0500 (EST)

On Fri, 17 Dec 1999, Ingo Molnar wrote:
>
> there is a bug in this area though, we do not re-run the need_resched
> check _after_ running do_signal(). We always run the check even if
> user-space is interrupted, but the problem is that it has to be restarted
> after delivering a signal too. The preliminary fix for this against
> 2.3.34-pre1 is attached, does it solve your problems? [patch works here
> just fine]

the patch works great, it solves the problem I was describing, at
least in preliminary testing (about 3-4 hours now).
>
> btw., this patch plus the hlt patch fixes the SysKonnect gigabit ethernet
> latency fluctuation i've noticed a couple of days ago - now latency over a
> real gigabit network is stable at 70 microseconds ... [it was fluctuating
> between 200 and 300 usecs before]
>
My testing shows +/-500usec typical, +/-1msec max on a PIII 500MHz
using 2.2.13 UP kernel. I will reduce my ktrace capture threshold
to see if I can find out why your results are so much better than mine.

Wm

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