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On Tue, Jun 06, 2006 at 12:35:28PM -0400, Bill Davidsen wrote: > Trond Myklebust wrote: > >On Tue, 2006-06-06 at 14:07 +0200, Klaus S. Madsen wrote: > >>Hi, > >> > >>We still experience the NFS client slow down reported by Jakob > >>Østergaard in http://lkml.org/lkml/2006/3/31/82, even with 2.6.17-rc6. > >> > >>Trond Myklebust have created a patch which we have verified solves this > >>problem for 2.6.16, 2.6.17-rc4 and 2.6.17-rc6. The patch is available > >>from http://lkml.org/lkml/2006/4/24/320, and as an attachment to > >>bugzilla bug 6557. > > > >The patch is already queued up for inclusion in 2.6.18. I'm not planning > >on submitting it for 2.6.17 since it is not a critical bug. > > I guess that depends on how much it slows down and how much you depend > on the speed of NFS. I have all of my machines sharing some local > binaries and docs, but the files are typically small and the network is > gigE, so I doubt it will hurt me. It hurts writing, not reading. And only certain cases of writing. But when it hurts it hurts quite a bit; slowdown is 10-20 times and gigE most likely won't matter. > On the other hand I do know people > running workstations with virtually everything NFS mounted, working with > large image files. > > The initial bug report makes it look as if it's about two orders of > magnitude slower, but doesn't quantify the effect on more common > sequential access operations. Sequential read and write seems to be fine. At least from my testing. This was what made this so weird; normal testing with dd or bonnie etc. showed all was fine. But link jobs over NFS were unreasonably slow. Turned out you needed a somewhat special read/write pattern (similar to ld) to trigger the slowdown. So I guess it's probably mostly people who do development over NFS who are hurt - and then only those who produce rather large executables. > If this becomes an issue in 2.6.17, I hope it will show up in -stable > before 2.6.18, the current development cycle is a bit, um, protracted... > lately. Me too :) -- / jakob - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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