Messages in this thread | | | Date | Sat, 26 Sep 2009 02:02:03 +0100 | Subject | Re: Regression: kernels since 2.6.26 are unusably slow | From | Aneurin Price <> |
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On Fri, Sep 25, 2009 at 23:51, Frans Pop <elendil@planet.nl> wrote: > Adding maintainers involved with the commit in CC. > > Aneurin Price wrote: >> Hi, >> Every kernel since 2.6.26 has been unusably slow for me - to the extent >> that I initially thought they were hanging on boot. Exactly how bad it is >> seems to vary, but it could take several minutes to boot, and then >> another minute or two to log in (with bash pegging the CPU as it loads). >> Everything seems to need vastly more CPU time than usual - it feels a >> little like I'm using a 486. >> >> I've bisected the problem down to commit >> 42651f15824d003e8357693ab72c4dbb3e280836 (x86: fix trimming e820 with >> MTRR holes). Having basically no idea what that means, I thought I'd try >> building a kernel with MTRRs disabled, to see if that would make any >> difference, but no joy. >> >> Can anyone give me some idea of where to go next, or let me know what >> further information I should provide? > > Let's start with some basic info. Can you please send your kernel config > and the output of 'dmesg' after a boot with a "slow" kernel? >
Attached. I'm not entirely convinced about the sanity of that kernel config, so if it might help I could repeat with a Debian packaged kernel, on the basis that it's presumably working without error for a large number of people.
> Also, what distribution do you use (and what is its release/version)? >
I'm using Debian unstable.
Hmm. Looking at dmesg for a 'working' kernel includes an interesting part which I foolishly forgot to save, saying that the last 512MB of memory is inaccessible (I was wondering where that last half-gig had gone :-)). I can go and check exactly what it says, but I don't have the energy left for any more reboots today. Anyway, that prompted me to try booting with mem=7168 - and that makes the problem go away. Perhaps that will shed some light on things.
Thanks, Nye [unhandled content-type:application/octet-stream][unhandled content-type:application/octet-stream] | |