Hi, On Wed 13-01-16 06:33:28, HUANG Weller (CM/ESW12-CN) wrote: > Could you tell me which IO-scheduler is best for flash based storage > device with ext4 ? Just search from WWW, I saw it is said that the noop > is best because the CFQ is design for the mechanical hard disk. And I > did the performance test with IOzone between the IO-scheduler noop and > cfq. The performance difference is small. So here I want to get some > answer from you about this question. Yes, CFQ is meant for classical rotational disk. For normal SSDs I use deadline IO scheduler (it does more request merging, prefers read over writes), for high-end I'd use noop. Honza -- Jan Kara <jack@xxxxxxxx> SUSE Labs, CR -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
