Re: 2.1.125 filesystem corruption under extreme load

Gregory Maxwell (linker@z.ml.org)
Sun, 29 Nov 1998 13:14:20 -0500 (EST)


> >vfork: Resource temporarily unavailable
>
> Memory. Probably memory fragmentation, a fork needs a continuous 8K
> block (2 pages). You can check by hitting Shift-ScrLock on the console
> if there are still 8k or bigger blocks free.
>
> If it is reproducible it is very bad, because that means that the mm
> needs more tuning

No just bad, very very very bad. 8k is the smallest unit that can have
frag problems, and it's very important that we can fork.

If this is happening to people then perhaps we need to delay 2.2 and wait
for the 2.3 big MM changes. How trivial is an emergency defragmenter?

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