Re: [PATCH] trim memory not covered by WB MTRRs

[Justin Piszcz <jpiszcz@lucidpixels.com>]

On Wed, 6 Jun 2007, Randy Dunlap wrote:

> On Wed, 6 Jun 2007 15:28:43 -0700 Jesse Barnes wrote:
>
> > On Wednesday, June 6, 2007 3:26 pm Justin Piszcz wrote:
> > > Nope, I booted with only netconsole= options.  I have a lot of HW in
> > > the box and I guess the buffer is too small.  Not sure where to
> > > change it in the kernel.  Looking..
> >
> > It's called "kernel log buffer size" and it's in "General setup".
>
> or you can just boot with "log_buf_len=256k" on the kernel boot line (e.g.)
>
> ---
> ~Randy
> *** Remember to use Documentation/SubmitChecklist when testing your code ***

Thanks, very useful note!

$ stress --vm 32 --vm-bytes 250M
stress: info: [4087] dispatching hogs: 0 cpu, 0 io, 32 vm, 0 hdd

Mem:   8039576k total,  5288036k used,  2751540k free,       12k buffers
Swap:        0k total,        0k used,        0k free,    37944k cached


$ stress --vm 40 --vm-bytes 250M
stress: info: [4120] dispatching hogs: 0 cpu, 0 io, 40 vm, 0 hdd
Mem:   8039576k total,  6661484k used,  1378092k free,       12k buffers
Swap:        0k total,        0k used,        0k free,    38000k cached

$ stress --vm 42 --vm-bytes 250M
stress: info: [4398] dispatching hogs: 0 cpu, 0 io, 42 vm, 0 hdd
Mem:   8039576k total,  6447048k used,  1592528k free,        8k buffers
Swap:        0k total,        0k used,        0k free,    11148k cached

$ stress --vm 45 --vm-bytes 250M
stress: info: [4352] dispatching hogs: 0 cpu, 0 io, 45 vm, 0 hdd
stress: FAIL: [4372] (494) hogvm malloc failed: Cannot allocate memory
stress: FAIL: [4352] (395) <-- worker 4372 returned error 1
stress: WARN: [4352] (397) now reaping child worker processes
stress: FAIL: [4352] (452) failed run completed in 4s

$ stress --vm 48 --vm-bytes 250M
stress: info: [4303] dispatching hogs: 0 cpu, 0 io, 48 vm, 0 hdd
stress: FAIL: [4323] (494) hogvm malloc failed: Cannot allocate memory
stress: FAIL: [4322] (494) hogvm malloc failed: Cannot allocate memory
stress: FAIL: [4303] (395) <-- worker 4323 returned error 1
stress: WARN: [4303] (397) now reaping child worker processes
stress: FAIL: [4303] (395) <-- worker 4322 returned error 1
stress: WARN: [4303] (397) now reaping child worker processes
stress: FAIL: [4303] (452) failed run completed in 4s

Is there a better way to verify I can use all the available memory?

Justin.
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