Date: Mon, 12 Jan 2004 13:12:08 -0800 (PST) From: Don Lewis <truckman@FreeBSD.org> To: mi@aldan.algebra.com Cc: current@FreeBSD.org Subject: Re: core-dumping over NFS Message-ID: <200401122112.i0CLC87E034120@gw.catspoiler.org> In-Reply-To: <200401121501.i0CF1eMC047055@aldan.algebra.com>
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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.
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