From owner-freebsd-hackers  Mon Jul 24 10:39:17 2000
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From: Charles Randall <crandall@matchlogic.com>
To: freebsd-hackers@freebsd.org
Subject: RE: Funky scheduler stuff under heavy I/O.
Date: Mon, 24 Jul 2000 11:38:58 -0600
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Could it be a boundary condition when the PCI bus gets saturated?

Charles

-----Original Message-----
From: Andreas Dobloug [mailto:andreasd@ifi.uio.no]
Sent: Monday, July 24, 2000 8:36 AM
To: freebsd-hackers@freebsd.org
Subject: Re: Funky scheduler stuff under heavy I/O.


* Jaye Mathisen
| 8 parallel DD's started at the same type creating 2GB cycbuffs (as fast as
| & can put them in the background).  (dd if=/dev/zero bs=1m count=2000
| of=blahblah)
| 
| Any brilliant ideas?

I've also experienced this on my scsi-drives (dual P2-350,
adaptec2940u2w controller). When doing extensive writes, this always
happens. The scan-rate (reported by vmstat) goes sky high, and the
system becomes unresponsive.

-- 
Andreas Dobloug : email: andreasd@ifi.uio.no


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