On Tue, Nov 22 2016, Robert LeBlanc wrote: > I'm looking to improve 'near' layout performance in raid10 and looking > at the code for read_balance, the comments mention that there is a > 'next expected sequential IO' sector number stored for the RAID array, > but I don't see such a variable in the struct, nor do I see in > read_balance where that variable is being updated. With such a value, > I could use it (with another variable) to guess if the current > requests are random or sequential enough to take the latency hit to > move drive heads to help parallel the read. This would be a much > simpler route than what I was thinking about previously. > > Am I just missing this variable? I would expect it to be in the > r10conf struct, would that be the right place to implement it if > doesn't exist? I think it is "head_position". NeilBrown > > Thanks, > ---------------- > Robert LeBlanc > PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html
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