All kernel changes are mentioned in the changelogs, so I think you can find what you want at kernel.org -- it also mentions who did the change, so you can contact him/her directly. I'm not saying you won't find help here, but the aforementioned is a better chance :) On Fri, Sep 11, 2009 at 6:48 PM, satha kottidi<satha_koti@xxxxxxxxxxx> wrote: > Hi Majed & All, > > Yes we two are working together. Actually we found a change in md/raid5.c > file in the function sync_request() it restricts the numbers, the kernel > 2.6.27 has code like this > > while(unlikely(!handle_stripe(sh, NULL))) > ; > But in kernel 2.6.21 it simply the handle_stripe(sh, NULL) call. > > Can anybody tell me the necessity of the change, and why it reduces the > numbers. Any comments is very helpful for me to analyze the driver further. > > > Thanks, > Satha. > > --- On Fri, 11/9/09, Majed B. <majedb@xxxxxxxxx> wrote: > > From: Majed B. <majedb@xxxxxxxxx> > Subject: Re: Raid 5 Read performance > To: "Koti" <satha_koti@xxxxxxxxxxx> > Cc: linux-raid@xxxxxxxxxxxxxxx > Date: Friday, 11 September, 2009, 1:47 AM > > Someone else has already emailed the mailing list about this. Are you > two running an assignment or something?! > > Check the mailing list archive for whatever people have already replied > with. > > On Thu, Sep 10, 2009 at 11:07 PM, Koti<satha_koti@xxxxxxxxxxx> wrote: >> Hi All >> >> I am trying measure the RAID 5 Read numbers on linux kernel-2.6.21 and >> kernel 2.6.27 the numbers are lower on later kernel (2.6.27). Iam >> measuring >> the numbers using "time dd" command (4GB ). Is any valid reason for this, >> or >> Am missing anything in the process. Can anybody help me in analyze this >> problem. >> >> Thanks, >> Koti >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-raid" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > > > > -- > Majed B. > > ________________________________ > Connect more, do more and share more with Yahoo! India Mail. Learn more. -- Majed B. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
