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Date: Tue, 17 Mar 2009 13:19:33 -0600 From: Chris Worley <worleys@...il.com> To: Eric Sandeen <sandeen@...hat.com> Cc: linux-ext4@...r.kernel.org Subject: Re: Overwriting w/ discard-capable drive causes soft-lockup in ext4 journal code, 2.6.28.8 On Tue, Mar 17, 2009 at 12:01 PM, Eric Sandeen <sandeen@...hat.com> wrote: > Chris Worley wrote: >> The issue I'm seeing is caused by running this repeatedly on an ext4 >> fs (2.6.28.8 kernel) w/ discards enabled (a ram-based MTD device >> contains the fs): >> >> while `true` >> do i=0 >> while [ $i -lt 100 ] >> do dd of=foo"$i" if=/dev/zero bs=1024k oflag=direct & >> let i=$i+1 >> done >> wait >> done >> >> (Note: the loop is intended to fill-up the fs w/ 100 dd threads... >> successive re-runs of the loop will rewrite the same files from >> scratch.) >> >> ... It causes "soft-lockup" issues on successive iterations, >> immediately as the DD's are launched, as previous foo files get their >> blocks discarded. > > I need to find a machine w/ more memory to test on :) but with a device > of half that size, on 2.6.29-rc7 machine w/ 2 cpus and 2G ram, I'm not > seeing it... > > Any chance you can try a 2.6.29-rcX kernel just to double-check? I'm not able to repeat w/ 2.6.29-rc8. The system just limps-along, though; SATA doesn't work, Ethernet doesn't work, and system response is slow... but disk speed is as expected, and no soft-lockup issues. Chris -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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