Messages in this thread | | | Date | Thu, 30 Apr 2009 14:15:24 +0900 | Subject | Re: [PATCH] range-bw: Another I/O scheduling policy of dm-ioband supporting the predicable I/O bandwidth (range bandwidth) | From | Dong-Jae Kang <> |
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Hi Ryo
I am sorry for delayed reply. I tested range-bw policy as you send me your configuration and I found some logical bugs in range-bw including big scheduling overhead.
> I used fio 1.22. The below is a script which I actually ran. > > #!/bin/sh > dev1=/dev/sdb4 # SATA disk > echo "0 $(sudo blockdev --getsize $dev1) ioband $dev1 share2 0 0 > cgroup range-bw 0" | sudo dmsetup create ioband1 > > arg="--time_based --runtime=10 --ioengine=libaio --iodepth=50 \ > --direct=1 --norandommap" > > dmsetup message ioband1 0 attach 2 > dmsetup message ioband1 0 attach 3 > dmsetup message ioband1 0 min-bw 2:100 > dmsetup message ioband1 0 max-bw 2:100 > dmsetup message ioband1 0 min-bw 3:200 > dmsetup message ioband1 0 max-bw 3:200
I recommend it is better to use different value in min-bw and max-bw because its concept is to support range-bw with the minimum guaranteeing and maximum limitation. exampe - min-bw : 1024 / max-bw : 3072
> echo $$ > /cgroup/grp1/tasks > fio $arg --rw=randread --name=grp1 --filename=/dev/mapper/ioband1 \ > --output=r2-1.log & > echo $$ > /cgroup/grp2/tasks > fio $arg --rw=randread --name=grp2 --filename=/dev/mapper/ioband1 \ > --output=r2-2.log & > wait > > Please feel free to ask me if you need more information. > > > I'm look forward to seeing the results. > Thanks for your comments. And I will fix the bugs and re-release it after several days at that time, I inform you about that.
Ryo, now, I am using bio-cgroup..... but, Is there additional things I have to consider to support AIO or dealyed I/O?
-- Best Regards, Dong-Jae Kang -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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