For now, I find it take long time in function metaslab_block_picker in
metaslab.c.
I guess there maybe many avl search actions.
I still not sure what cause the avl search and if there is any
parameters to tune for it.
Any suggestions?
On 06/08/2011 05:57 PM, Markus Kovero wrote:
Hi, also see;
http://www.mail-archive.com/zfs-discuss@opensolaris.org/msg45408.html
We hit this with Sol11 though, not sure if it's possible with sol10
Yours
Markus Kovero
-----Original Message-----
From: zfs-discuss-boun...@opensolaris.org
[mailto:zfs-discuss-boun...@opensolaris.org] On Behalf Of Ding Honghui
Sent: 8. kesäkuuta 2011 6:07
To: zfs-discuss@opensolaris.org
Subject: [zfs-discuss] Wired write performance problem
Hi,
I got a wired write performance and need your help.
One day, the write performance of zfs degrade.
The write performance decrease from 60MB/s to about 6MB/s in sequence write.
Command:
date;dd if=/dev/zero of=block bs=1024*128 count=10000;date
The hardware configuration is 1 Dell MD3000 and 1 MD1000 with 30 disks.
The OS is Solaris 10U8, zpool version 15 and zfs version 4.
I run Dtrace to trace the write performance:
fbt:zfs:zfs_write:entry
{
self->ts = timestamp;
}
fbt:zfs:zfs_write:return
/self->ts/
{
@time = quantize(timestamp-self->ts);
self->ts = 0;
}
It shows
value ------------- Distribution ------------- count
8192 | 0
16384 | 16
32768 |@@@@@@@@@@@@@@@@@@@@@@@@ 3270
65536 |@@@@@@@ 898
131072 |@@@@@@@ 985
262144 | 33
524288 | 1
1048576 | 1
2097152 | 3
4194304 | 0
8388608 |@ 180
16777216 | 33
33554432 | 0
67108864 | 0
134217728 | 0
268435456 | 1
536870912 | 1
1073741824 | 2
2147483648 | 0
4294967296 | 0
8589934592 | 0
17179869184 | 2
34359738368 | 3
68719476736 | 0
Compare to a working well storage(1 MD3000), the max write time of zfs_write is
4294967296, it is about 10 times faster.
Any suggestions?
Thanks
Ding
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