[Samba] Slow on one client Win7 program
Huibert van Andel
info at opdepc.nl
Tue Sep 25 00:22:31 MDT 2012
> Got one program that is running very, very slow on version 3.6.8.
> Using SMB2, logging level 3 I saw a lot of these:
> [2012/09/24 23:44:43.824970, 3] smbd/smb2_read.c:356(smb2_read_complete)
> smbd_smb2_read: fnum=[8523/filename] length=2 offset=1656 read=2
> [2012/09/24 23:44:43.825499, 3] lib/util.c:1498(fcntl_getlock)
> fcntl_getlock: fd 34 is returned info 2 pid 0
> Seems the files are read in chunks of 2 bytes a call.
> Most of the files the program is reading are a few Mb,
> so why is it only reading 2 bytes at a time?
> In ver 3.6.7 I made a few tests also, and it does matter what you choose
> for locking, e.g.:
> kernel oplocks = no
> oplocks = no
> level2 oplocks = yes
> Some tests worked better (e.g. no locks at all), some not, though with
> 3.6.8 none provides speed.
> Anyway 3.6.7 had other bugs and was unusable.
> Other programs seem not to be affected (poss. they don't use smb2?).
Another few tests does make a difference:
kernel oplocks = no
oplocks = yes
level2 oplocks = yes
[2012/09/25 08:17:39.042639, 3] smbd/smb2_read.c:356(smb2_read_complete)
smbd_smb2_read: fnum=[4824/filename] length=65536 offset=4030464
[2012/09/25 08:17:39.046235, 3] smbd/smb2_read.c:356(smb2_read_complete)
smbd_smb2_read: fnum=[4824/filename] length=65536 offset=4096000
[2012/09/25 08:17:39.050502, 3] smbd/smb2_read.c:356(smb2_read_complete)
smbd_smb2_read: fnum=[4824/filename] length=32768 offset=4161536
Seems oplocks = yes is fairly stable to give large reads and speed.
But why is this?
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