core-dumping over NFS
dwhite at gumbysoft.com
Tue Jan 13 09:03:51 PST 2004
On Mon, 12 Jan 2004, Don Lewis wrote:
> >> On 12 Jan, Mikhail Teterin wrote:
> >> > . 5.2-CURRENT (Dec 14) server, RedHat-9 client:
> >> > core is created properly, but sometimes the server goes
> >> > into a frenzy with the sys-component (bufdaemon) taking
> >> > up the entire 100% of the CPU-time (P4 at 2GHz); it only
> >> > writes @4Mb/s (~14% of the disk's bandwidth) and the
> >> > only cure is to restart the /etc/rc.d/nfsd; trying to,
> >> > for example, switch from X11 to a textual console, when
> >> > this is happening reliably hangs the machine.
> >> I saw something similar a in the last month when running iozone on a
> >> FreeBSD client with an nfs file system mounted from a FreeBSD server. I
> >> think this was in the 5.2-BETA timeframe. The client typically ran out
> >> of CPU first, but the server was not far behind. This happened in the
> >> tests with the larger file and/or block sizes. Bufdaemon was typically
> >> the big consumer of CPU.
> > Hm, I can attempt to reproduce this on 5.2-rel or -current. Can you
> > provide the options used to iozone?
> I think I used the defaults other than cranking up the max file size go
> 1GB to match the memory size on my server. It took a long time to run
> the full set of tests ...
OK, I'll tive it a try. NFS between different FreeBSD versions in my
pile-o-machinery have all come up OK, but I'll try against redhat.
Doug White | FreeBSD: The Power to Serve
dwhite at gumbysoft.com | www.FreeBSD.org
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