On 01/05/2011 07:23 PM, torn5 wrote:
May I also ask what is the /dev/block/device/queue/nr_requests ? I thought it was the max length of the request queue, but... if I set a low number like 32 I often see higher values with iostat -x 1 in avgqu-sz. E.g. now it's at 32 and I saw a 58. Is it maybe because it can reach 2*nr_requests, that is, nr_requests for writes and again nr_requests for reads?
Yeah, 2 * nr_requests due to it is nr_requests of writes and then you get nr_requests of reads. There is also code in the block layer to start congestion handling based on some number divided by nr_requests value.
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