Messages in this thread |  | | | Date | Mon, 11 Jul 2011 09:05:20 -0400 | | From | Vivek Goyal <> | | Subject | Re: [PATCH 0/3]CFQ: add think time check for service tree and group |
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On Mon, Jul 11, 2011 at 01:44:05PM +0800, Shaohua Li wrote: > 2011/7/4 Shaohua Li <shaohua.li@intel.com>: > > Hi, > > Currently when the last queue of a service tree/group is empty, CFQ > > doesn't expire the queue. This is to allow requests from the tree/group > > come soon, so tree/group doesn't miss its share. But if the think time > > is big, the assumption isn't correct. idling the queue is just wasting > > bandwidth. > > > > Originally I was hoping this can resolve Vivek's fsync issue, but it > > doesn't. The fsync issue is caused by queue idling. But since think time > > check only helps for think time above default queue idle time (8ms), > > think time check doesn't help. > > > > On the other hand, think time check is still helpful for queues with > > think time. I had test case in follow patches show throughput > > improvement without sacrifice tree/group shares. > > > Jens, > can you look at the patches? I refreshed some patches in replying > Vivek, I can resend if required.
Yep, please resend. That would be easier.
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