On 04/14/2010 10:51 PM, Brian Lavender wrote: > I would think that you need to tune your filesystem. How about this > article on "On-demand readahead" > > http://lwn.net/Articles/235164/
Ah, I found this: http://www.redhat.com/magazine/001nov04/features/vm/#tuning-vm What I'd recommend is pick a design point. Taking this graph: http://broadley.org/bill/random-read.png Then the number of clients you plan to have simultaneously, set min_readahead so you can have a reasonable memory footprint and good performance. Say you only had a single few year old single 1TB disk (like in the graph). If you set min_readahead to 2MB the I/O system should be able to provide 60MB/sec. You should be able to manage 60MB/sec, the default on my disk was 128KB, which would lead to a bottleneck 12MB/sec or so. Next time my mirror gets busy (likely around the LTS release) I'll see if I can collect some real world numbers. _______________________________________________ vox-tech mailing list [email protected] http://lists.lugod.org/mailman/listinfo/vox-tech
