On Fri, May 06, 2011 at 09:37:12AM +0000, Richard Kearsley wrote:
> Is aio used while reading files from proxy_cache?

Yes, it works. For FreeBSD I recommend this settings:

sendfile on;
aio sendfile;
tcp_nopush on;
read_ahead 512k;

> I test aio on a file every 1s (it should be in ram buffers, so no disk io needed)
> Usually it takes 1ms (or lower), but sometimes it spikes to over a second if disks are really busy
> The max_aio_queue doesn't go above 3-4 during test
> Any ideas the cause of spikes?

May be locks on VFS level. You can try this:

open_file_cache max=5000 inactive=20s;
open_file_cache_valid 30s;
open_file_cache_min_uses 3;


--
Igor Sysoev

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