[Samba] Gigabit Throughput too low

[Paul Griffith]

Greetings, 

Can you post more info on your setup, i.e - configuration of machine,
etc....

I am also looking into Linux network stack tweaks. I have seen my
tweaks posted for GigE, but you have to be careful. You may actually
get a lower throughput.

For example:
 sysctl -w net.ipv4.tcp_mem='8388608 8388608 8388608'

This tell your kernel it can use

8388608 pages ( a page is 4K on the Intel platform) for all your TCP
currently in use.


so (8388608 * 4096)/1048576 = 32768MB

Take a look at:

http://ipsysctl-tutorial.frozentux.net/ipsysctl-tutorial.html



On Fri, May 13, 2005 at 12:06:29PM -0500, Duncan, Brian M. wrote:
> 
> Hi I was wondering if you ever got better performance out of your
> Gigabit/IDE/Fc2?
> 
> I am facing a similar situation. I am running FC2 with Samba 3.x
> 
> My problem lies in not that I am limited to 10 MBytes per second
> sustained.  I think it's related to this pdflush and how it's buffers
> are setup. (I have been doing some research and before 2.6 kernels
> bdflush was the method that was used and it was tweakable.  Have yet to
> find anything on HOW to tweak pdflush.
> 
> My issue is that I can copy over the network at 15+ MBytes per second
> but then after a few minutes it will drop to 4-8 MBytes per second.  Yet
> a drive to drive copy on the linux box itself can sustain 14+ MBytes per
> second on the same size file. (4+ gigs) While I watch a Top when the
> network copying is going on PDFlush is bouncing around with Samba, not
> sure what is going on.
> 
> Was curious if you had improved your situation, and if you did what you
> did.
> 
> BTW here are some tweaks for network stack related stuff for Gig.
> 
> sysctl -w net.core.rmem_max=8388608
> sysctl -w net.core.wmem_max=8388608
> sysctl -w net.core.rmem_default=65536
> sysctl -w net.core.wmem_default=65536
> sysctl -w net.ipv4.tcp_rmem='4096 87380 8388608'
> sysctl -w net.ipv4.tcp_wmem='4096 65536 8388608'
> sysctl -w net.ipv4.tcp_mem='8388608 8388608 8388608'
> sysctl -w net.ipv4.route.flush=1
> 
> 
> 
> Brian M. Duncan
> Katten Muchin Rosenman LLP
> 525 West Monroe Street
> Chicago IL 60661-3693
> 312-577-8045
> 
> brian.duncan at kattenlaw.com
> 
> 
> 
> 
> 
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