Messages in this thread | | | Date | Thu, 15 May 2008 15:35:44 -0400 | From | David Fix <> | Subject | Hello and a question about high cpu usage on jfsCommit (kernel 2.6.25.1) |
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Hey guys,
I'm new to the list, but I've been using Linux and fooling around with the kernel for ages. :)
I've been experiencing high CPU usage for jfsCommit on kernel 2.6.25.1 (haven't had a chance to go to 2.6.25.4, but I didn't see any JFS-specific changes between the versions yet). Here's my hardware config, as well:
CPUs: 2x Intel Xeon E5420 2.5GHz Quad-core RAM: 8GB RAID Controller: 3Ware 9650SE-24M8
I can't find a mention of what motherboard I have in here, so I'll give a bit of lspci:
00:00.0 Host bridge: Intel Corporation 5000P Chipset Memory Controller Hub (rev b1) 00:1d.0 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB Controller #1 (rev 09) 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev d9) 01:00.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express Upstream Port (rev 01) 03:00.0 PCI bridge: Integrated Device Technology, Inc. Unknown device 8018 (rev 04) (prog-if 00 [Normal decode]) 05:00.0 Ethernet controller: Intel Corporation 82571EB Gigabit Ethernet Controller (rev 06) 07:00.0 Ethernet controller: Intel Corporation 80003ES2LAN Gigabit Ethernet Controller (Copper) (rev 01) 0c:00.0 RAID bus controller: 3ware Inc 9650SE SATA-II RAID (rev 01) 0f:0c.0 VGA compatible controller: ATI Technologies Inc ES1000 (rev 02)
There's the salient points there. The NIC is a quad, which is trunked to the switch using LAPC.
I've got a RAID-6 on the 3Ware controller of 20 TB, and when I'm running "top", I see this:
--- top - 15:33:27 up 5:40, 3 users, load average: 4.33, 3.59, 3.98 Tasks: 315 total, 2 running, 313 sleeping, 0 stopped, 0 zombie Cpu(s): 0.2%us, 13.2%sy, 0.0%ni, 61.3%id, 24.9%wa, 0.1%hi, 0.2%si, 0.0%st Mem: 8194264k total, 8144500k used, 49764k free, 3884k buffers Swap: 16779884k total, 148k used, 16779736k free, 7667400k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 2669 root 15 -5 0 0 0 R 99 0.0 19:45.71 jfsCommit ---
And people are complaining (and I'm seeing) very slow writes to the drives.
Just wondering if anyone has any ideas. :) If you need any information, I'll provide whatever you need.
Thanks in advance!
Dave
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