Messages in this thread | | | Date | Mon, 24 Nov 2008 19:36:04 -0600 | From | Eric Sandeen <> | Subject | Re: Extreme slowness with xfs [WAS: Re: Slowness with new pc] |
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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
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