> I have a drive that is capable of delivering >12 MB/s. By using dd on
> the block device (reading in more data than I have RAM), I quickly get
> to a state where I'm getting << 1 MB/s. My guess is that I'm getting
> 100 kB/s or less. Once this happens, it seems easiest to reboot to
> bring things back to a sane state.
One thing I found was that the buffer cache hash is now too small. Try
increasing the order of it in fs/buffer.c:buffer_init().
Cheers,
Anton
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