core-dumping over NFS
dwhite at gumbysoft.com
Mon Jan 12 14:13:18 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?
Doug White | FreeBSD: The Power to Serve
dwhite at gumbysoft.com | www.FreeBSD.org
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