Messages in this thread | | | Date | Sat, 15 Jun 2002 19:17:11 +0200 | From | Jens Axboe <> | Subject | Re: [PATCH] 2.5.21 IDE 91 |
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On Sat, Jun 15 2002, rwhron@earthlink.net wrote: > > One possibile culprit here is the doubling of the request queue size > > in 2.5.20. A long time ago it was 1024 slots. Then it went to > > 128. That's where it is in Marcelo kernels. Then -ac kernels > > went up to 1024 because they have read-latency2. Somehow 2.5 found > > itself at 256 slots. In 2.5.20 it slealthily snuck up to 512 > > slots. I didn't squeak about this because I was interested to see what > > effect it would have. > > Interesting. I've seen read-latency2 drop dbench throughput in -aa > kernels (but I use it anyway). I'd like to capture the request > queue size. Is there a command or file in /proc that displays > it, or should I just grep drivers/block/ll_rw_blk.c?
There is currently no way you can capture the queue request state. In the past I've done sysrq hacks to display it, but that's about it.
-- Jens Axboe
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