Re: [PATCH 00/23] Adaptive read-ahead V11

From: Wu Fengguang
Date: Sat Mar 18 2006 - 22:50:41 EST

On Sat, Mar 18, 2006 at 10:10:43PM -0500, Jon Smirl wrote:
> This is probably a readahead problem. The lighttpd people that are
> encountering this problem are not regular lkml readers.

My general conclusion is that since they were able to write a user
space implementation that avoids the problem something must be broken
in the kernel readahead logic for sendfile().

Maybe the user space solution does the trick by using a larger window size?

IMHO, the stock read-ahead is not designed with extremely high concurrency in
mind. However, 100 streams should not be a problem at all.

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