Re: posible latency issues in seq_read

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Lee Revell wrote:
On 7/20/07, Chris Friesen <[email protected]> wrote:

We've run into an issue (on 2.6.10) where calling "lsof" triggers lost
packets on our server.  Preempt is disabled, and NAPI is enabled.

Can you reproduce with a recent kernel?  Lots of latency issues have
been fixed since then.

Unfortunately I have to fix it on this version (the bug was found on shipped product), so if there was a difference I'd have to isolate the changes and backport them. Also, I can't run the software that triggers the problem on a newer kernel as it has dependencies on various patches that are not in mainline.

Basically what I'd like to know is whether calling schedule() in seq_read() is safe or whether it would break assumptions made by seq_file users.

Chris
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