On 08/04/2010 07:45 PM, Alexander Graf wrote:
I see two alternatives out of this mess: 1) Speed up string PIO so we're actually fast again.
Certainly, the best option given that it needs no new interfaces, and improves the most workloads.
2) Using a different interface (that could also be DMA fw_cfg - remember, we're on a private interface anyways)
A guest/host interface is not private.
Admittedly 1 would also help in more cases than just booting with -kernel and -initrd, but if that won't get us to acceptable levels (and yes, 8 seconds for 100MB is unacceptable) I don't see any way around 2.
3) don't use -kernel for 100MB or more. It's not the right tool. -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain.
