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Message-ID: <20090413045452.GA16038@night.netis.ru> Date: Mon, 13 Apr 2009 08:54:52 +0400 From: "Alexander V. Lukyanov" <lav@...is.ru> To: Theodore Tso <tytso@....edu>, linux-kernel@...r.kernel.org Subject: Re: 2.6.29.1 vs 2.6.27.21 ext4 performance problem On Fri, Apr 10, 2009 at 12:36:20PM -0400, Theodore Tso wrote: > Does the differences go away if you do echo 0 into > /sys/fs/ext4/<dev>/inode_readahead_blks? Yes! Thanks for the tip. I think the problem here is that there are lots of files (2M per file system) and the access is random. > Are you seeing an increase in time, or decrease in transactions per > second, or just that there is is an increase in read rates? Load average goes up from 6 to 30, and request latency increases. -- Alexander.. -- 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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