* Charles Randall
| Could it be a boundary condition when the PCI bus gets saturated?
When this happens there's at least 5000-6500 interrupts/sec
on the SCSI-controller (reported by systat).
How many cycles do each interrupt use? (ahc-driver+SMP)
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Andreas Dobloug
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Could it be a boundary condition when the PCI bus gets saturated?
Charles
-Original Message-
From: Andreas Dobloug [mailto:[EMAIL PROTECTED]]
Sent: Monday, July 24, 2000 8:36 AM
To: [EMAIL PROTECTED]
Subject: Re: Funky scheduler stuff under heavy I/O.
* Jaye Mathisen
| 8 parallel DD&#
* 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
Well, I ran it by Soren, he didn't think so. And Originally when I
noticed it, I thought it was vinum (although I'm not using vinum in this
case), and mentioned it to greg, and he was leaning that way as well...
I'm not sure I buy the controller argument anyway.
For each pair of drives on each
>
> both the Master and Slave drives on the first channel of
> each controller are about 200MB's ahead of the master
> and slave drives on the second channel of each
> controller, and the gap is growing.
>
Umm. This sounds more like your controllers are doing this. You could stick
in another two
Noticing something a tad odd here, under 4.0-stable, as of 6/27.
8 identical drives, (all IDE, all connected to identical IDE PCI
controllers).
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=bl
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