This does not look like a VM issue at all - at this point you're already
getting only 10MB/s, yet the VM isn't even involved (there's definitely no
VM pressure here).
> Notice how there's planty of RAM. I'm writing sequentially to a file
> on the ext2 filesystem. The disk I'm writing on is a 7200rpm IDE,
> capable of ~ 22 MB/s and I'm still getting only ~ 9 MB/s. Weird!
Are you sure you haven't lost some DMA setting or something?
Linus
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