Hey guys,
I'm new to the list, but I've been using Linux and fooling around with
the kernel for ages. :) I posted this to linux-kernel as well, but
figured it might have been lost and not seen by the right eyes. :)
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). This is under a fair
load, with about 50 machines accessing the data. This is x86_64,
running CentOS 5. I built the kernel myself, and it's a modular kernel.
Here's my hardware config:
CPUs: Two Intel Xeons - Both are E5420 2.5GHz Quad-core
RAM: 8GB
RAID Controller: 3Ware 9650SE-24M8
I can't find the documentation of what motherboard I have in there, 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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