Messages in this thread | ![/](/images/icornerl.gif) | | Date | Sun, 13 Jul 2003 12:45:58 -0400 | From | Jeff Garzik <> | Subject | Re: RFC on io-stalls patch |
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Chris Mason wrote: > Well, I'd say it's a more common problem to have lots of writes, but it > is pretty easy to fill the queue with reads.
Well....
* you will usually have more reads than writes * reads are more dependent than writes, on the whole * writes are larger due to delays and merging
All this is obviously workload dependent, but it seems like the 60% common case, at least...
Basically when I hear people talking about lots of writes, that seems to be downplaying the fact that seeing 20 writes and 2 reads on a queue does not take into account the userspace applications currently blocking, waiting to do another read.
Jeff
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