r780 - in trunk/varnish-cache: . bin/varnishd
phk at phk.freebsd.dk
Thu Aug 10 09:11:27 CEST 2006
In message <ujrhd0ldqj1.fsf at cat.linpro.no>, Dag-Erling =?iso-8859-1?Q?Sm=F8rgra
>Even so, the behaviour I was seeing was far worse than I expected: CPU
>usage was pegged at 100% (almost all of it in system time) even with
>no clients; strace confirmed that nothing else was going on than a
>ping from the management process every three seconds.
Did it stay in the kernel or did it do a lot of system calls ?
What was the return value of poll(2) ?
The timeout argument is probably more suspect than the fd.
>I don't know if
>this has anything to do with passing in bogus pollfds (with fd = -1);
>a colleague looked through the kernel source while I was working on
>the epoll code and could not find anything to indicate that this
>should be a problem.
fd = -1 is specifically allowed:
If the value of fd is less than 0, events shall be ignored,
and revents shall be set to 0 in that entry on return from
Poll(2) suffers from the same discrepancy as select(2): you have
to do the entire setup on every call, no state is retained in the
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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