"Expensive timeout(9) function..."
phk at phk.freebsd.dk
Tue Apr 1 04:37:49 PST 2003
In message <20030401123319.GA8399 at comp.chem.msu.su>, Yar Tikhiy writes:
>I'm getting the following DIAGNOSTIC messages on my -CURRENT box:
> Expensive timeout(9) function: 0xc02677e0(0) 0.006095064 s
>(it's uma_timeout(), which triggers the warning once per boot)
> Expensive timeout(9) function: 0xc0141610(0xc0dfcc00) 0.006581587 s
> Expensive timeout(9) function: 0xc0141610(0xc0dfcc00) 0.008510173 s
>(and this one is fxp_tick(); it triggers the warning from time to time)
>Are those warnings harmless?
Yes, but indicative of code which needs attention, but harmless.
>As far as my understanding of the issue reaches, a timeout function
>is called under protection of the Giant mutex unless it's marked
>as MP-safe, and that's the reason to spend as little time as possible
>in it. Right?
Yes, but there are other reasons why you would generally not want
to spend too much time in the timeout function, mostly that it may
screw up other time-critical things in the system.
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phk at FreeBSD.ORG | TCP/IP since RFC 956
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