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> 1) If you don't need to know when a file was last accessed, mount the > ext3 file system with the -noatime option. This disables updating of > the "Last Accessed On:" property, which should significantly increase > throughput. Yes, already did that. Should have noted our fstab entry: /dev/sda2 / ext3 defaults,noatime 1 1 > /sbin/elvtune -r 16384 -w 8192 /dev/mount-point > where mount-point is the partition (e.g. /dev/hda5) Thanks, we'll give this a try. Didn't know about this one before. > 3) If the above don't work, double the journal size. As you noted, we seem to be doing more reads than writes, so I'd be suprised if 192M wasn't enough... > P.S. You'd probably get more help from the ext3 mailing list. I wasn't too sure that it was an I/O problem, which is why I posted here. As the vmstat output showed, there didn't seem to be any sudden excessive I/O occuring, but the load would jump enormously. Maybe we should definitely try some different journaling modes, or disabling journalling all together, to test if that is the actual culprit... Rob PS. I forgot to include the uptime dump in my last post. I just wanted to show how spikey it was. Basically there's a long falling off decay, and then a sudden spike again... which decays off... and then spikes again... basically repeat what you see below over and over and over in 5-10 minute intervals... 1:29am up 23:50, 3 users, load average: 0.35, 2.49, 2.73 1:29am up 23:51, 2 users, load average: 0.45, 2.44, 2.71 1:29am up 23:51, 2 users, load average: 0.70, 2.42, 2.71 1:29am up 23:51, 2 users, load average: 0.59, 2.34, 2.68 1:29am up 23:51, 2 users, load average: 0.58, 2.28, 2.65 1:29am up 23:51, 2 users, load average: 0.49, 2.21, 2.62 1:30am up 23:51, 2 users, load average: 0.49, 2.15, 2.60 1:30am up 23:52, 2 users, load average: 21.39, 6.43, 3.98 1:30am up 23:52, 2 users, load average: 18.10, 6.22, 3.94 1:30am up 23:52, 2 users, load average: 15.32, 6.01, 3.89 1:30am up 23:52, 2 users, load average: 13.04, 5.83, 3.86 1:30am up 23:52, 2 users, load average: 11.03, 5.64, 3.81 1:31am up 23:52, 2 users, load average: 9.41, 5.47, 3.78 1:31am up 23:53, 2 users, load average: 7.96, 5.29, 3.74 1:31am up 23:53, 2 users, load average: 6.81, 5.13, 3.70 1:31am up 23:53, 2 users, load average: 5.76, 4.96, 3.66 1:31am up 23:53, 2 users, load average: 4.88, 4.80, 3.62 1:31am up 23:53, 2 users, load average: 4.13, 4.64, 3.58 1:32am up 23:53, 2 users, load average: 3.49, 4.48, 3.54 1:32am up 23:54, 2 users, load average: 2.95, 4.34, 3.51 1:32am up 23:54, 2 users, load average: 2.50, 4.19, 3.47 1:32am up 23:54, 2 users, load average: 2.12, 4.05, 3.43 1:32am up 23:54, 2 users, load average: 1.79, 3.92, 3.39 1:32am up 23:54, 2 users, load average: 1.51, 3.79, 3.36 1:33am up 23:54, 2 users, load average: 1.43, 3.70, 3.33 1:33am up 23:55, 2 users, load average: 1.21, 3.58, 3.30 1:33am up 23:55, 2 users, load average: 1.03, 3.46, 3.26 1:33am up 23:55, 2 users, load average: 1.03, 3.38, 3.23 1:33am up 23:55, 2 users, load average: 0.87, 3.27, 3.20 1:33am up 23:55, 2 users, load average: 0.82, 3.17, 3.17 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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