Re: [BUG?] RAID sub system / tux

From: Roy Sigurd Karlsbakk (
Date: Thu Dec 13 2001 - 10:04:34 EST

> > After testing this for a while, I'm quite sure there's some kind of bug
> > that locks up I/O under heavy traffic.
> there's definitely no problem with heavy load on one stream,
> or with multistream load and default readahead settings.
> (I certianly have tested the former, and the latter is tested
> by all the dbench scores you see here). I'm guessing you'd
> see no lockup if you removed the readahead. though it's also worth
> asking: have you memtest86's the cpu/ram? and can you cause the
> lock with single-threaded bonnie? also, do you have highmem on?

I have highmem turned off.

By using default readahead (124), starting the 50 streams, killing them,
and restarting them, I reproduced the problem. I rebooted the server
before this.

I haven't memtest86'd the hardware, but I will. I still beleive this is an
OS problem - not hardware

Roy Sigurd Karlsbakk, MCSE, MCNE, CLS, LCA

Computers are like air conditioners. They stop working when you open Windows.

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This archive was generated by hypermail 2b29 : Sat Dec 15 2001 - 21:00:26 EST