Messages in this thread | | | Date | Wed, 4 Oct 2000 18:10:00 +0200 | From | David Weinehall <> | Subject | Re: VM in v2.4.0test9 |
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On Wed, Oct 04, 2000 at 01:01:21PM -0300, Rik van Riel wrote: > On Wed, 4 Oct 2000, David Weinehall wrote: > > > Running the included program on a clean v2.4.0test9 kernel I can > > hang the computer practically in no time. > > > What seems most strange is that the doesn't even get depleated. > > The machine still answers to SysRq and ping, but nothing else. > > Looking again at this report in more detail, something > very strange is going on ... > > > This is what I got from SysRq+M (manual copy): > > > > Free pages: 500 kB (0 highmem) > > Active: 8 inactive dirty: 1009, inactive clean:0 > > free: 125 (31 62 93) > > First, you have MORE free memory than freepages.high. In this > case I really don't see why __alloc_pages() wouldn't give the > memory to your processes ....
Beats the hell out of me.
> > Free swap: 64772 > > And there is tons of swap free... > > Are you absolutely sure this is VM related? This almost looks
Nope. All I'm sure of is that the v2.2.xx kernels doesn't show the same behaviour, so it _shouldn't_ (but you never know...) be broken hardware. Of course, the v2.4 might stress the memory harder or something like that.
> like the system puts a in a read request but the request queue > doesn't get unplugged, or something strange like that ... > > There is more than enough memory to satisfy all VM requests and > the loop in __alloc_pages() is straightforward enough to give > your processes their memory without strange bugs ...
Yup. If you want to, I can put some debugging printk's into the kernel whereever you might want them and run more tests. I don't compile the kernel on this machine, so I have no problems recompiling. And it's a dedicated test-machine anyway, so there's nothing on that machine which I'd cry over if lost.
I'm about to perform the same test on a K6-3/350 with 64 MB mem and >200 MB swap now, just for the fun of it.
/David _ _ // David Weinehall <tao@acc.umu.se> /> Northern lights wander \\ // Project MCA Linux hacker // Dance across the winter sky // \> http://www.acc.umu.se/~tao/ </ Full colour fire </ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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