[Samba] Diagnosing Performance Issues

Shane Arnold clontarf_x at iinet.net.au
Mon Oct 4 00:15:12 MDT 2010

  Unfortunately an strace of the smbd process provides me with nothing 
useful as I am not a samba developer. However I'll happily provide the 
strace output for anyone interested :)

On 04/10/2010 2:05 PM, Volker Lendecke wrote:
> On Mon, Oct 04, 2010 at 01:21:39PM +0800, Shane Arnold wrote:
>> First off my apologies if this is the wrong place to be asking.
>> I seem to have a problem where the smbd process is using a massive
>> amount of CPU for network transfers. It averages about 70-90% usage
>> on both cores of a dual-core machine when transferring between disks
>> (or over the network) using samba/cifs shares.
>> Along with this I also notice the transfers going from a steady
>> 30-40mb/sec to anywhere from 1-4MB/sec. It seems to resolve itself
>> then re-occur multiple times during a transfer. I have tried
>> tweaking buffer settings and the like with no success.
>> iostat shows corresponding transfer rates that match what Windows is
>> reporting for transfer speeds.
>> Any ideas where I can start looking? I've done a fair bit of
>> looking, but I'm not quite ready to say it's a hardware problem just
>> yet.
> strace'ing the smbd might be a start...
> Volker

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