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IBM ThinkCentre A50 Slowdown

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Ian Gulliver
2019-04-21 16:48:25 +00:00
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I’ve got a bunch of IBM ThinkCentre A50 machines that can’t run linux-2.6, tested 2.6.8 - 2.6.15. They boot and work for up to 24 hours, then they just get horribly slow (60 seconds+ on any I/O). Sometimes, they speed up again for awhile, then slow down. A reboot always fixes it. The kernel sysrq backtrace of the issue is the oddest part. Here’s top hanging:
Sep 16 00:48:20 localhost kernel: top S C0392F20 0 5582 4634 (NOTLB)
Sep 16 00:48:20 localhost kernel: c2859ebc 00000086 c45b8520 c0392f20 c2859f98 cf764f00 392f2780 000f62c9
Sep 16 00:48:20 localhost kernel: 00000000 c45b8520 392f2780 000f62c9 c2858000 c2859ed0 00000246 00000000
Sep 16 00:48:20 localhost kernel: 00000000 0221df22 c2859ed0 ce7ccc00 00000000 c02a853d c2859ed0 0221df22
Sep 16 00:48:20 localhost kernel: Call Trace:
Sep 16 00:48:20 localhost kernel: [schedule_timeout+93/208] schedule_timeout+0x5d/0xd0
Sep 16 00:48:20 localhost kernel: [proc_pid_readdir+97/560] proc_pid_readdir+0x61/0x230
Sep 16 00:48:20 localhost kernel: [process_timeout+0/16] process_timeout+0x0/0x10
Sep 16 00:48:20 localhost kernel: [do_select+671/848] do_select+0x29f/0x350
Sep 16 00:48:20 localhost kernel: [proc_info_read+165/192] proc_info_read+0xa5/0xc0
Sep 16 00:48:20 localhost kernel: [__pollwait+0/208] __pollwait+0x0/0xd0
Sep 16 00:48:20 localhost kernel: [sys_select+578/992] sys_select+0x242/0x3e0
Sep 16 00:48:20 localhost kernel: [syscall_call+7/11] syscall_call+0x7/0xb
Blocking in I/O I can handle, but I/O on /proc?!?!
Oh, and 2.4.27 works fine.
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1. 2009-Sep-11: [Confusing BIND with CNAMEs](2009-09-11-confusing-bind-with-cnames.html)
1. 2009-Feb-19: [The odd case of my mugging](2019-02-19-the-odd-case-of-my-mugging.html)
1. 2009-Feb-03: [5-packet TCP connection?](2009-02-03-5-packet-tcp-connection.html)
1. 2006-Jan-23: [IBM ThinkCentre A50 Slowdown](2006-01-23-ibm-thinkcentre-a50-slowdown.html)
1. 2006-Jan-23: [SSH Tunnelling 101](2006-01-23-ssh-tunnelling-101.html)
1. 2006-Jan-23: [How to install Debian Sarge on an IBM Blade](2006-01-23-how-to-install-debian-sarge-on-an-ibm-blade.html)
1. 2006-Jan-22: [Why does my machine think its name is localhost...](2006-01-22-why-does-my-machine-think-its-name-is-localhost-even-though-i-changed-it.html)