Re: [squid-users] squidaio_queue_request: WARNING - Queue congestion

tor 2010-02-18 klockan 14:51 +1300 skrev Amos Jeffries:

> Henrik seems to have re-appeared and he has more disk IO experience then
> me so may have an idea whet to look for ... ?

My first reaction is to run a small benchmark in parallel to squid
performing a reasonably slow sequence of random reads over the disks and
measuring the response time.. SSD disks in particular may have a habit
of "randomly" block all requests for a while during/after a period of
writes.. and OS write buffering and batching may even add to this queue
latency problem.

But I have not read up on the whole problem description.

Also keep in mind that as Amos mentioned earlier these "Queue
congestion" warnings come more frequently after start as there is a
filter preventing the logs from getting overwhelmed with this warning.

Regards
Henrik
Received on Thu Feb 18 2010 - 02:05:17 MST