Hi all We're having an odd problem running 2.6.17.6 on two of our Dell 2850 machines. They work fine at first, but then suddenly it seems that the IO locks up. Using hdparm to get some rough numbers, we see < 200KB/sec throughput. Both the machines work fine with 2.4.30 (CONFIG_MEGARAID2) and we're running the new megaraid (CONFIG_MEGARAID_MM) on 2.6.17.6 now. I saw this in the list archives and it seemed to help: echo 8 > /sys/block/sda/queue/nr_requests Here's the dmesg lines for megaraid - we're not seeing anything logged when the machine slows right down. megaraid cmm: 2.20.2.6 (Release Date: Mon Mar 7 00:01:03 EST 2005) megaraid: 2.20.4.8 (Release Date: Mon Apr 11 12:27:22 EST 2006) megaraid: probe new device 0x1028:0x0013:0x1028:0x016d: bus 2:slot 14:func 0 megaraid: fw version:[521S] bios version:[H430] Some graphs of what happens: http://lethe.uwa.edu.au/lrrd/Servers/cyllene.uwa.edu.au.html (the spike in eth0 connections and number of processes seems to be related to a lot of pop/imap processes stuck in iowait) It's an odd problem, is there anything we can try? Any suggestions would be really appreciated - if any more info would help debugging this, just let me know.. Cheers Grahame -- Grahame Bowland Email: grahame.bowland@xxxxxxxxxx Information Technology Services Phone: +61 8 6488 1175 The University of Western Australia Fax: +61 8 6488 1109 CRICOS: 00126G - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
