[dm-devel] [Lsf-pc] [LSF/MM TOPIC] a few storage topics
Jeff Moyer
jmoyer at redhat.com
Tue Jan 24 19:11:55 UTC 2012
Christoph Hellwig <hch at infradead.org> writes:
> All three filesystems use the generic mpages code for reads, so they
> all get the same (bad) I/O patterns. Looks like we need to fix this up
> ASAP.
Actually, in discussing this with Vivek, he mentioned that read ahead
might be involved. Sure enough, after bumping read_ahead_kb, 1MB I/Os
are sent down to the storage (for xfs anyway).
Cheers,
Jeff
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