[Samba] Dropped frames streaming video to samba

Matt London mlondon at alltec.com
Wed Apr 19 21:31:50 GMT 2006


We've got a setup here with a samba server in front of a fibrechannel array. It's a pretty vanilla samba setup exporting an xfs filesystem.

The box is an opteron 265 with 4G RAM and a QLogic QLA2312 HBA running SLES9.

We can dd an 8G file to a share from a windows workstation in just over 2 minutes (about 65MB/s) and dd back in about 4 minutes.

Local disk performance in the machine gives about 195MB/s to disk and 120MB/s from disk.

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.

Any ideas would be much appreciated.

Best regards,

--Matt London
Alliance Technologies
Tel: (416) 385 3255 x232
Fax: (416) 385 1774

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