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SubjectRe: allocation failures with CBQ bandwidth limiting & high net use (was Re: Filesystem kernel hangup, 2.6.3 (bad: scheduling while atomic!))
Brad Allen <Ulmo-Usenet@Usenet.Q.Net> wrote:
>
> My MTU for GbE (e1000) is 9000, and NFS block size 8192 bytes.
> That GbE is a consumer grade Intel model.
> ....
> swapper: page allocation failure. order:3, mode:0x20

The kernel simply doesn't have a hope of being able to find eight
physically-contiguous free pages at interrupt time.

You'll get some benefit from increasing /proc/sys/vm/min_free_kbytes

But it's beginning to look like we need separately-managed higher-order
page pools for this. At least.

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