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Message-ID: <20080216172048.GB3979@ucw.cz> Date: Sat, 16 Feb 2008 17:20:49 +0000 From: Pavel Machek <pavel@....cz> To: Lukas Hejtmanek <xhejtman@....muni.cz> Cc: linux-kernel@...r.kernel.org Subject: Re: Disk schedulers Hi! > whom should I blame about disk schedulers? > > I have the following setup: > 1Gb network > 2GB RAM > disk write speed about 20MB/s > > If I'm scping file (about 500MB) from the network (which is faster than the > local disk), any process is totally unable to read anything from the local disk > till the scp finishes. It is not caused by low free memory, while scping > I have 500MB of free memory (not cached or buffered). > > I tried cfq and anticipatory scheduler, none is different. Is cat /dev/zero > file enough to reproduce this? ext3 filesystem? Will cat /etc/passwd work while machine is unresponsive? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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