Re: [PATCH v2] proc: speedup /proc/stat handling

[Eric Dumazet]

Le mardi 24 janvier 2012 Ã 16:12 -0800, Andrew Morton a Ãcrit :

> Did you measure the improvement from this patch?

Unfortunately I can not reboot the server where I noticed this
performance problem.

On the smaller one, performance improvement is about 20%, because the
second run of show_stat() can use data present in cpu cache.

On big machines, I guess the 128 bytes per possible cpu reservation can
avoid the second run. (since a typical cpuXXX line is smaller than 128
bytes)



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