Messages in this thread | | | Date | Mon, 7 Feb 2005 00:09:22 -0300 | From | Werner Almesberger <> | Subject | Re: [PATCH]sched: Isochronous class v2 for unprivileged soft rt scheduling |
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[ Cc:s trimmed, added abiss-general ]
Con Kolivas wrote: > Possibly reiserfs journal related. That has larger non-preemptible code > sections.
If I understand your workload right, it should consist mainly of computation, networking (?), and disk reads.
I don't know much about ReiserFS, but in some experiments with ext3, using ABISS, we found that a reader application competing with best effort readers would experience worst-case delays of dozens of milliseconds.
They were caused by journaled atime updates. Mounting the file system with "noatime" reduced delays to a few hundred microseconds (still worst-case).
- Werner
-- _________________________________________________________________________ / Werner Almesberger, Buenos Aires, Argentina wa@almesberger.net / /_http://www.almesberger.net/____________________________________________/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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