[Samba] Dropped frames streaming video to samba

Volker Lendecke Volker.Lendecke at SerNet.DE
Thu Apr 20 07:41:14 GMT 2006

On Wed, Apr 19, 2006 at 05:31:50PM -0400, Matt London wrote:
> The problem comes when trying to capture video using Adobe
> Premiere 6.5 and write straight to the share - we get a
> *lot* of dropped frames (somewhere in the region of 25%+).
> Yet the same job to an Adaptec Snap server (which is samba
> on adaptec's guardianOS) works fine, even through it can
> only sustain 10MB/s.

There are a lot of variables here that need quite thorough
testing. Does Adobe Premiere write a single big file? If it
does, what is the write performance that you get with for
example xcopy or a copy by explorer. This gives you some
indication, but it is by no means the full story. Next step
in analyzing this is watching the *exact* pattern of write
calls that Adobe Premiere uses and look for latencies there.
Even the network card drivers can have a big influence on a
workload like that, also fibre channel is not always the
silver bullet that people believe it is. FC drivers can also
introduce stalls that influence streaming performance.

Lots of diagnosis work for you I'm afraid.

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