Hi Ryo I attached new file that includes I/O total bandwidth of evaluation system. We tested total bandwidth of weight policy by I/O in Dom0 and DomU system and it is measured through iostat tool and dm-ioband debug patch which I gave you several months ago. Of course, the result in prior report was measured by dm-ioband debug patch. As a result, the big difference in prior report derives from the location where we measured I/O bandwidth iostat counts it in application level and dm-ioband debug patch does it in dm-ioband controller. I think the difference is related with buffer cache. Thank you. Have a nice weekend 2009/8/27 Dong-Jae Kang <baramsori72@xxxxxxxxx> > Hi Ryo > > 2009/8/27 Ryo Tsuruta <ryov@xxxxxxxxxxxxx> > > Hi Dong-Jae, >> >> # I've added dm-devel to Cc:. >> >> Dong-Jae Kang <baramsori72@xxxxxxxxx> wrote: >> > Hi Ryo >> > >> > I attached new test result file(ioband-partition-based-evaluation.xls)in >> > this mail. >> >> Thanks for your great job. >> >> > In this time, it is not virtualization environment. >> > I evaluated partition-based use cases before I do it in vitualization >> > environment. >> > because I think the two cases are smilar each other. >> > >> > The detailed information about the evaluation can be referred in >> attached >> > file. >> > >> > If you have any questions or comments after examine it, >> > please give me your opinion. >> >> I would like to know the throughput without dm-ioband in your >> environment. Because the total throughput of range-bw policy is >> 8000KB/s, which means the device has a capability to perform over >> 8000KB/s, but the total throughput of weight policy is lower than >> the range-bw policy. In my environment, there is no significant >> difference in average throughput between with and without dm-ioband. >> I ran fio in the way described in your result file. Here are the >> results of my environment. The throughputs were calculated from >> "iostat -k 1" outputs. >> >> buffered write test >> Avg. throughput [KB/s] >> w/o ioband w/ioband >> sdb2 14485 5788 >> sdb3 12494 22295 >> total 26979 28030 >> > > OK, good comments. > I omitted the total bandwidth of the evaluation system. > > I will reply to you about it tomorrow after I check and re-test it again. > >> >> Thanks, >> Ryo Tsuruta >> > > Thank you for comments. > > > -- > Best Regards, > Dong-Jae Kang > -- Best Regards, Dong-Jae Kang
Attachment:
total bandwidth result.xls
Description: MS-Excel spreadsheet
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