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Date: Thu, 23 Oct 2008 20:28:51 +0900 (JST) From: Ryo Tsuruta <ryov@...inux.co.jp> To: haotian.zhang@...driver.com Cc: zumeng.chen@...driver.com, bruce.ashfield@...driver.com, linux-kernel@...r.kernel.org, dm-devel@...hat.com, containers@...ts.linux-foundation.org, virtualization@...ts.linux-foundation.org, xen-devel@...ts.xensource.com, fernando@....ntt.co.jp Subject: Re: [PATCH 0/2] dm-ioband: I/O bandwidth controller v1.8.0: Introduction Hi Haotian, > The results are almost the same. I can not see any change of Direct I/O > performance for this bio-cgroup kernel feature with dm-ioband support! > > Does the methord to caculate throughout should be the Rate of xdd.linux > output? > Dose my testing approach should be correct? If not, please help me point > out. Could you try to run the xdd programs simultaneously? dm-ioband controls bandwidth while I/O requests are issued simultaneously from processes which belong to different cgroup. If I/O requests are only issued from processes which belong to one cgroup, the processes can use the whole bandwidth. The following URL is an example of how bandwidth is shared to I/O load change. http://people.valinux.co.jp/~ryov/dm-ioband/benchmark/partition1.html Thanks, Ryo Tsuruta -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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