Hello Dong-Jae, Dong-Jae Kang wrote, on 08/31/2009 03:16 AM: > Hi Munehiro Ikeda > Thanks for your attention. > and sorry for late reply. No problem. > 2009/8/29 Munehiro Ikeda <m-ikeda@xxxxxxxxxxxxx > <mailto:m-ikeda@xxxxxxxxxxxxx>> > > Hello Dong-Jae, > > Dong-Jae Kang wrote, on 08/26/2009 09:46 PM: > > Hi Ryo > > I attached new test result > file(ioband-partition-based-evaluation.xls)in > this mail. > 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. > > Thank you. > > > Good work. > Please let me ask silly questions. > > (1) About what "target" means > I guess "device" means writing to device files directly > (--filename=/dev/mapper/ioband1) > and "directory" means mounting these device files and writing to > some directory > on the filesystem > (--filename=/mnt/ioband1/test.dat, I'm assuming mount > /dev/mapper/ioband1 on > /mnt/ioband1), > am I wright? > > Yes, you are right. > I also think the terms can leave misunderstanding. :) > > > (2) Conditions in RDF sheet > Conditions in sheet "RDF" and "RBF" are same but results are > slightly different. > Should "Mode" in RDF sheet be "Direct"? > > As the Report sheet in the file shows, > "D" in RDF means Direct I/O and "B" in RBF means Buffered I/O(delayed I/O). > I think the reason for difference in result, especially several > fluctuation in RBF, is > related with buffer cache and pdflushd daemon. > So, generally, I/O bandwidth controll in direct I/O mode is > more accurate than that of buffered I/O mode. Alright, I see. Completely no fluctuation in direct write is interesting. Thank you for the explanation. Muuhh -- IKEDA, Munehiro NEC Corporation of America m-ikeda@xxxxxxxxxxxxx _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
