On Thu, 31 Jan 2008 11:15:08 +0100 Andi Kleen <[EMAIL PROTECTED]> wrote:
> Peter Zijlstra <[EMAIL PROTECTED]> writes: > > > > Ah, that is Lennarts Pulse Audio thing, he has samples in memory which > > might not have been used for a while, and he wants to be able to > > pre-fetch those when he suspects they might need to be played. So that > > once the audio thread comes along and stuffs them down /dev/dsp its all > > nice in memory. > > The real problem that seems to make swapping so slow is that the data > tends to be badly fragmented on the swap partition. I suspect if that > problem was attached the need for such prefetching would be far less > because swap in would be much faster. > Yeah, the 2.5 switch to physical scanning killed us there. I still don't know why my allocate-swapspace-according-to-virtual-address change didn't help. Much. Marcelo played with that a bit too. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
