Messages in this thread | | | Date | Tue, 16 Nov 2004 07:33:11 -0200 | From | Marcelo Tosatti <> | Subject | Re: Kernel 2.6.9 Multiple Page Allocation Failures |
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On Sat, Nov 13, 2004 at 03:47:43PM +0100, Stefan Schmidt wrote: > On Fri, Nov 12, 2004 at 11:09:29PM +1100, Nick Piggin wrote: > > OK. Occasional page allocation failures are not a problem, although > > if it is an order-0 allocation it may be an idea to increase > > min_free_kbytes a bit more. > What about more than occasional but more like constant errors? ;) > > > I think you said earlier that you had min_free_kbytes set to 8192? > > Well after applying my patch, the memory watermarks get squashed > > down, so you'd want to set it to at least 16384 afterward. Maybe > > more. > I took the default from 2.6.10-rc1-bk19 with your patch and doubled it. No > luck with the following values subsequently applied: > #vm.min_free_kbytes=3831 > #vm.min_free_kbytes=7662 > #vm.min_free_kbytes=15324 > #vm.min_free_kbytes=61296 > vm.min_free_kbytes=65535 > Did not help against the page allocation errors or boosting up the machines > performance.
Nick, such high reservations should have protected the system from OOM.
> I got XFS filesystem corruption in the end which (just) perhaps was triggered by > page allocation errors for it says: > XFS internal error XFS_WANT_CORRUPTED_RETURN after several page allocation > errors for the application having XFS in its stack trace leading to: > kernel: xfs_force_shutdown(sdd5,0x8) called from line 1091 of file > fs/xfs/xfs_trans.c. Return address = 0xc0212e5c > kernel: Filesystem "sdd5": Corruption of in-memory data detected. > Shutting down filesystem: sdd5 > kernel: Please umount the filesystem, and rectify the problem(s) > > Corruption of in-memory data sounds like something we would not want to > happen, right?
Definately. I suspect XFS is unable to handle OOM graciously, or some other problem.
> I attached full traces to http://oss.sgi.com/bugzilla/show_bug.cgi?id=345 which > is an rather old ticket dealing with page allocation errors and xfs but > perhaps it does fit. > > Stefan - 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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