New ZFSv28 patchset for 8-STABLE
bra at fsn.hu
Sat Jan 1 18:36:43 UTC 2011
On 12/16/2010 01:44 PM, Martin Matuska wrote:
> Link to the patch:
I've used this:
on a server with amd64, 8 G RAM, acting as a file server on
ftp/http/rsync, the content being read only mounted with nullfs in
jails, and the daemons use sendfile (ftp and http).
The effects can be seen here:
the exact moment of the switch can be seen on zfs_mem-week.png, where
the L2 ARC has been discarded.
What I see:
- increased CPU load
- decreased L2 ARC hit rate, decreased SSD (ad), therefore increased
hard disk load (IOPS graph)
Maybe I could accept the higher system load as normal, because there
were a lot of things changed between v15 and v28 (but I was hoping if I
use the same feature set, it will require less CPU), but dropping the
L2ARC hit rate so radically seems to be a major issue somewhere.
As you can see from the memory stats, I have enough kernel memory to
hold the L2 headers, so the L2 devices got filled up to their maximum
Any ideas on what could cause these? I haven't upgraded the pool version
and nothing was changed in the pool or in the file system.
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