Re: [PATCH] cfq-iosched: reduce write depth only if sync was delayed

From: Jeff Moyer
Date: Wed Dec 09 2009 - 13:10:04 EST


Corrado Zoccolo <czoccolo@xxxxxxxxx> writes:

> The numbers look good. Now, there is no penalty in having low_latency
> set for sequential writes, and just a small penalty for random ones.
> The fact that random reads are faster with low_latency set is interesting.
> Is the test is running with your patched tiobench (so that the number
> of random operations is comparable with sequential ones)?

No, I forgot all about that. The number of random operations defaults
to 4000, which is pretty low. I'll re-run the tests with a number
comparable to the sequential runs. Sorry about that.

Cheers,
Jeff
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/