[Samba] linux 2 linux transfer very slow

[Jean-Yves F. Barbier]

Jeff Layton a écrit :
> On Mon, 26 Oct 2009 00:24:48 +0100
> "Jean-Yves F. Barbier" <12ukwn at gmail.com> wrote:
> 
>> SVR
>> Debian sid V. 3.4.2-1
>> CLI
>> Debian lenny
>> =====================
>>
>> Hi list,
>>
>> Sometimes ago I noticed a samba slowing down but as I don't use it 
>> very much it was not a PB (NO conf changes.)
>>
>> Today I made this test on CLI:
>> mount -t cifs //svr/myshare /mnt/ -o username=myuser,password=mypw,ro
>> then: 
>> cp /mnt/films/20090911_0025_footage.avi . (this one's 2GB)
>>
>> The speed (measured w/ iptraf) is terribly slow (~750KB/s), so I made 
>> another test: ftp using filezilla: ~7500KB/s (!)
>>
>> There's nothing special in my conf file, and I've got a line as doc say:
>> socket options = TCP_NODELAY IPTOS_LOWDELAY SO_RCVBUF=8192 SO_SNDBUF=8192
>>
>> I really don't understand why there's so much difference between samba & ftp
>> mostly because formerly (well, may be a year ago) there was only a very small
>> gap between these speeds.
> 
> This probably has little to do with samba and more to do with the fact
> that writes with Linux CIFS are essentially synchronous within the
> context of a single thread.

Ok, I'm gonna make another try with old smbfs to see if there's any difference

> That said, your SO_RCVBUF size seems very small. You probably at least
> need to make it large enough to hold a few writes before closing the
> window. The folks who work on the samba server might be able to offer
> better guidance as to a size.

I read other docs and climb them up to 65535, with the same result :(

JY
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