δΊ 2012/4/28 14:58, Volker Lendecke ει:
On Sat, Apr 28, 2012 at 01:46:35PM +0800, Zhiming Zhou wrote:
I use Iometer to test normal file read/write performance,
at first, SMB2 is not enabled,test 1MB sequential read/write performance
with SMB1, I got 610 MB/s write performance which
is really good, while read performance is just 280 MB/s.
Then I change "max protocol" to "SMB2" in smb.conf to enable
SMB2, other configs in smb.conf are not changed, restart samba,
reconnect in Windows 2008, use Iometer to run test again, I got
470 MB/s write performance and 505 MB/s read performance.
It's quite good that read performance bursts with SMB2, but
write performace droped by 140 MB/s, I run this write test
serveral times again, write performance indeed droped a lot,
so is it normal that SMB2 write performance is slower than
SMB1?
No, this is not normal. Maybe you want to enable async I/O.
Depending on the platform, plain aio might work with
aio write size = 1
It might be a good idea to also enable
vfs objects = aio_fork
With latest Samba Jeremy Allison has also added the
aio_pthread module, but that is not yet in released code.
You can get it from the latest v3-6-test branch in our git
repository.
With best regards,
Volker Lendecke
Tested SMB2 write peformance again under 10Gb network with AIO enabled,
I set
aio write size = 1
and got 332.17 MB/s output, which is slower than previous 470 MB/s (AIO
disabled),
enable aio_fork vfs object, test result is almost the same.
In my opinion, SMB2 write should be faster than SMB1 even when AIO is
disabled,
isn't it?
Thanks
Regards
Uranus Zhou
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