On 06/19/2012 03:13 PM, Ted Ts'o wrote:
On Tue, Jun 19, 2012 at 02:54:44PM -0500, Zachary Mark wrote:
Ted, thanks for the patches! I've tested your patches against
3.5~rc3. I had to return the machine on which I first spotted the
problem, but here are results from a box with identical hardware:
df from 3.0:
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sdh1 2907178636 205816 2906972820 1%
/dev/sdi1 2907178636 1056768 2906121868 1%
df from 3.2.20 (identical to 3.5~rc3 without your patches):
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sdh1 2928733612 21760792 2906972820 1%
/dev/sdi1 2928733612 22611744 2906121868 1%
df from 3.5~rc3 with your patches applied (as they didn't apply to 3.2):
/dev/sdh1 2907178636 205816 2906972820 1%
/dev/sdi1 2907178636 1060936 2906117700 1%
sdh1 is mostly empty. sdi1 has about 6700 128k files written to it plus
everything on sdh1. There seems to be slightly more overhead accounted
for after your patches. Not sure if this is to be expected or not.
Hmm... it looks like df output /dev/sdh1 is identical between 3.0 and
3.5~rc3 with my patches. I'm not sure why there is a difference for
/dev/sdi1. However, I note that the "Available" figure is the same
between 3.0, 3.2.20 and 3.5~rc3 for /dev/sdh1, but there is a
difference in the Available column between 3.2.20 and 3.5~rc3 for
/dev/sdi3. Could it be that some files got written to /dev/sdi
between your test run?
It would be good if we could get this sorted out. I was pretty
careful to account for all of the fs overhead blocks between when I
did my patch with an empty file system.
If this can't be accounted by more files being written to /dev/sdi1,
could you send me the (compressed, since they will be large) output of
dumpe2fs for /dev/sdh1 and /dev/sdi1 with the "df" output from your
three test kernel so I can investigate further?
Thanks,
- Ted
Actually, you're right, I must have screwed up my original test somehow.
I just repeated the test. The 3.0 and 3.5~rc3-patched numbers are
identical to each other, and the 3.2.20/3.5~rc3-unpatched are also
identical to each other.
-- Zach
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