Messages in this thread | | | From | Måns Rullgård <> | Subject | Re: [PATCH][RFC] 4K stacks default, not a debug thing any more...? | Date | Tue, 17 Jul 2007 00:39:48 +0100 |
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utz lehmann <lkml123@s2y4n2c.de> writes:
> On Tue, 2007-07-17 at 00:28 +0200, Rene Herman wrote: >> Given that as Arjan stated Fedora and even RHEL have been using 4K >> stacks for some time now, and certainly the latter being a >> distribution which I would expect to both host a relatively large >> number of lvm/md/xfs and what stackeaters have you users and to be >> fairly conservative with respect to the chances of scribbling over >> kernel memory (I'm a trusting person...) it seems there might at >> this stage only be very few offenders left. > > I have to recompile the fedora kernel rpms (fc6, f7) with 8k stacks on > my i686 server. It's using NFS -> XFS -> DM -> MD (raid1) -> IDE disks. > With 4k stacks it crash (hang) within minutes after using NFS. > With 8k stacks it's rock solid. No crashes within months.
Running either vanilla or Gentoo kernels, I've had no luck at all with 4k stacks. On SATA+MD(raid1)+LVM+XFS I've had numerous crashes when doing even light I/O. One particularly crash-prone scenario is writing to random locations in sparse files, thus forcing new blocks to be allocated.
I don't have dedicated testing machines, so I can't afford the time and potential data loss of testing this regularly. I have no shortage on RAM with 8k stacks, so for me the choice is quite simple.
-- Måns Rullgård mans@mansr.com
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