rawhide ext4/virtio FS performance hit (10x slower) ?
jwboyer at gmail.com
Mon May 7 13:07:05 UTC 2012
On Mon, May 7, 2012 at 8:43 AM, Jim Meyering <jim at meyering.net> wrote:
> Today I noticed that some tests from coreutils' test suite
> were taking far longer than they used to on rawhide.
> For example, run this command in an empty directory:
> seq 200000|env time xargs touch
> it takes < 5s on F17 3.3.4-1.fc17.x86_64 ext4/sdb8/SSD, yet
> it takes 47s on rawhide 3.4.0-0.rc5.git5.1.fc18.x86_64 ext4/vda1/SSD
> 10x performance hit... ouch.
> Does anyone know why?
Rawhide has all the kernel debug options turned on. It isn't
worthwhile doing a comparison when those are enabled. You could try
again with the first -rc6 build that shows up, as that will have the
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