[Samba] Multichannel working at half speed with 2x NICs

Jeremy Allison jra at samba.org
Wed Sep 28 22:52:56 UTC 2016

On Wed, Sep 28, 2016 at 09:59:53PM +0000, Kanchana Marasinghe wrote:
> Sorry for the delay Jeremy. I ran strace on the lowest pid for smbd (I ran
> "pidof smbd" to get pids, and used the lowest one of the 4 or so that came
> up).
> Command was "strace -f -o strace.log `ls /proc/2019/task/ | xargs -n 1 echo
> -n " -p`". I then copied a 1.3GB file from the server to my client to
> generate traffic. The resulting file was around 93k lines (15MB). I've
> copied the first 2000 lines since it looks like the rest are
> repeats/similar: http://pastebin.com/raw/2EJsk0An
> I can provide the full file as well if required.

I don't see any pread/pwrite calls - so this looks like a
meta-data heavy workload with few reads/writes (which means
multichannel won't help much).

In fact I don't see any reads/writes at all, which is
strange for a file copy :-).

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