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Message-ID: <9e4733910909230523v47d1fb3fn2575ed5d8e86069c@mail.gmail.com> Date: Wed, 23 Sep 2009 08:23:51 -0400 From: Jon Smirl <jonsmirl@...il.com> To: whansard@...global.net Cc: linux-kernel@...r.kernel.org Subject: Re: disk speed regression kernel 2.6.29 and after On Wed, Sep 23, 2009 at 8:08 AM, will <whansard@...global.net> wrote: > I had been using an old 2.6.22 kernel on my machine, and I often backup one > partition of my main hard drive to a partition on a second hard drive. The > main hard drive is sata 640 gigs, and the second is a pata 320 gig. copying > this partition from one drive to the other with dd takes about 3 minutes and > 30 seconds. When I installed kernel 2.6.30, and 2.6.31, the time took 9 > minutes and 20 seconds. I decided to go to the trouble of compiling all the > kernels between, and kernels 2.6.22-2.6.28 all do the operation in about 3 Download the kernel source using git. Then use 'git bisect' to find the exact commit that is causing problems. 'git bisect' does a binary search so it homes in on the problem commit quickly. Once you know the exact commit it is much easier to find the problem. > minutes and 30 seconds. 2.6.29- newer all take about 9 minutes and 20 > seconds. The partition is 16 gigs. each drive seems to be as fast as before > otherwise, it's just much slower copying from one drive to another, which I > do very often. This is an nforce 3 based motherboard, amd southbridge, i > think, with 4 gigs of ram, athlon 64x2. 32 bit kernel. has anyone heard of > this problem? > I currently have 3 hard drives hooked up. > a 200 gig on a promise controller, > a 320 gig on the amd pata? > a 640 sata on the nv i think. > The motherboard is a Asrock-AM2NF3-VSTA > copying this partition with dd or cat or schily's dd between any of these 3 > different hard drives takes different times depending on the speed of the > drive with > kernels 2.6.22-2.6.28, but takes about 9 minutes and 30 seconds on any of > the drives > with the kernels 2.6.29 and after. > Please cc me with any followups or anything. thanks. > -- > 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/ > -- Jon Smirl jonsmirl@...il.com -- 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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