Re: Warning - running *really* short on DMA buffers while doingfile
Andrew Morton (firstname.lastname@example.org)
Fri, 27 Sep 2002 12:07:55 -0700
"Justin T. Gibbs" wrote:
> > The evidence is here:
> > http://marc.theaimsgroup.com/?l=linux-kernel&m=103302456113997&w=1
> Which unfortunately characterizes only a single symptom without breaking
> it down on a transaction by transaction basis. We need to understand
> how many writes were queued by the OS to the drive between each read to
> know if the drive is actually allowing writes to pass reads or not.
Given that I measured a two-second read latency with four tags,
that would be about 60 megabytes of write traffic after the
read was submitted. Say, 120 requests. That's with a tag
depth of four.
Not sure how old the disk is. It's a 36G Fujitsu SCA-2. Manufactured
in 2000, perhaps??
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