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Date: Tue, 25 Nov 2008 04:56:24 -0500 (EST) From: Justin Piszcz <jpiszcz@...idpixels.com> To: Eric Sandeen <sandeen@...deen.net> cc: Stian Jordet <liste@...det.net>, linux-kernel@...r.kernel.org, xfs@....sgi.com, Alan Piszcz <ap@...arrain.com> Subject: Re: Extreme slowness with xfs [WAS: Re: Slowness with new pc] On Mon, 24 Nov 2008, Eric Sandeen wrote: > Stian Jordet wrote: >> ma., 24.11.2008 kl. 04.50 -0500, skrev Justin Piszcz: >>> While there still may be something else wrong, the first problem I see is >>> your sunit and swidth are set to 0. >>> >>> Please read, a good article on what they are and how to set them: >>> http://www.socalsysadmin.com/ >> >> Oh, this was new to me. But the setting didn't change anything. I can >> copy one large file between the xfs and ext3 disk (both ways), and I get >> speeds between 160 and 200 MB/s. But unpacking the kernel source takes >> between 5 and 10 minutes on the xfs disk, and a mere 15 seconds on the >> ext3... (and it also used to take between 5 and 10 minutes when I had >> xfs on the raid0, so it doesn't seem to be hardware related...) >> >> If anyone has anything more I can try before I do the lengthy process of >> backup 1TB, reformat and restore... > > I don't know if the storage you're on passes barriers or not, but xfs > has barriers on by default, while ext3 does not. ext3 will still likely > win the "untar a kernel" race, but for a fairer test, make the barrier > settings consistent between the two. > > -Eric > barriers enabled: $ time bash -c 'tar xf linux-2.6.27.7.tar; sync' block 573932: ** Block of NULs ** Total bytes read: 293857280 (281MiB, 1.9MiB/s) real 2m40.643s user 0m0.194s sys 0m1.541s barriers disabled: time bash -c 'tar xf linux-2.6.27.7.tar; sync' block 573932: ** Block of NULs ** Total bytes read: 293857280 (281MiB, 11MiB/s) real 0m27.612s user 0m0.182s sys 0m1.617s -- 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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