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Message-ID: <20090616154342.GA7043@p15145560.pureserver.info> Date: Tue, 16 Jun 2009 17:43:42 +0200 From: Ralf Gross <rg@...-softwaretechnik.com> To: linux-kernel@...r.kernel.org Subject: io-scheduler tuning for better read/write ratio Hi, I'm trying to tune the kernel/io-scheduler for better read/write ratio on a Areca RAID0 device (4 disks, kernel 2.6.26, xfs fs). I can get 200 MB/s seq. writes and about the same for seq. reads. My problem is that if there are reads _and_ writes on this device, the write throughput is much higher than the read throughput (40 MB/s read, 90 MB/s write). The deadline scheduler sounded like the way to go for getting better read results, but reagardless which parameter I change, the ratio keeps the same. cfq, noop.. different paramter settings, but alway the same result. short: is there a way to tune the kernel/scheduler settings in a way to get a higher read throughput? Writes are not that important, basicially there are only two 30 GB files on the device/filesystem that are used to spool data for two LTO-4 tape drives. So I need a certain read speed to keep both drives streaming. While the data gets written to one file, I need at least 50 MB/s for reading from the other file and sent to the tape drive. Thanks, Ralf -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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