Mailinglist Archive: opensuse (1239 mails)

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[opensuse] XFS and openSUSE 12.1
  • From: Roger Oberholtzer <roger@xxxxxx>
  • Date: Mon, 03 Jun 2013 11:14:07 +0200
  • Message-id: <1370250847.30766.10.camel@acme.pacific>
I am using XFS on a 12.1 system. The system records jpeg data to large
files in real time. We have used XFS for this for a while since it has
as a listed feature that it is well suited to writing streaming media
data. We have used this for quite a while on openSUSE 11.2.

We have developed a new version of this system that collects more data.
What I have found is that the jpeg data is typically written at the
speed I expect. Every once in a while, the write takes 100x longer.
Instead of the expected 80 msecs or so to do the compress and write, it
takes, say, 4 or 5 seconds. I have looked in all the usual suspect
places, and nothing seems to point at anything. For one test, I wrote
to /dev/null instead of the real file, The delays do not happen. They do
seem to be related to actually writing to the physical disk.

I expect some delay occasionally when disks are physically flushed.
There is buffering in our application to allow this. But 5 seconds is
simply wrong.

So, I am curious if anyone has seen performance issues like this with
XFS on openSUSE 12.1.

Yours sincerely,

Roger Oberholtzer

Ramböll RST / Systems

Office: Int +46 10-615 60 20
Mobile: Int +46 70-815 1696

Ramböll Sverige AB
Krukmakargatan 21
P.O. Box 17009
SE-104 62 Stockholm, Sweden

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