on 04/01/2014 14:50 Vladimir Sharun said the following:
[snip]
> ARC: 28G Total, 2085M MFU, 20G MRU, 29M Anon, 1858M Header, 3855M Other
[snip]
> ITEM SIZE LIMIT USED FREE REQ FAIL SLEEP
[snip]
> zio_data_buf_131072: 131072, 0, 488217, 9,287155442, 0, 0
I noticed a particular discrepancy between reported ARC usage and sizes of UMA
zones used by ZFS code:
488217 * 131072 = ~59GB right there.
There are several possibilities for this discrepancy:
- bad accounting or reporting of ARC stats
- those 128K buffers being used in a special way and thus not accounted as ARC
- some sort of resource leak
You could try to use DTrace to gather the stacks of all code paths that lead to
allocation of those buffers. Something like:
fbt::zio_data_buf_alloc:entry
/arg0 == 131072/
{
@[stack()] = count();
}
This could be a start for understanding the issue.
--
Andriy Gapon
_______________________________________________
freebsd-current@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-current
To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
