Messages in this thread | | | Date | Fri, 27 Sep 2002 12:07:55 -0700 | From | Andrew Morton <> | Subject | Re: Warning - running *really* short on DMA buffers while doingfile transfers |
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"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?? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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