Re: [Xen-devel] [PATCH] xen: arm: add missing flushing dcache to the copy to/clean guest functions

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Tue, 26 Nov 2013, Oleksandr Dmytryshyn wrote:
> Hi to all.
> 
> Currently we use Dom0 kernel size about 30 MBytes (on Panda5 board).
> 
> I've measured a flushing time in the 2 cases:
> 1. Flush about 30 MBytes (flush_xen_dcache_va_range() function) -  1280 uS
> 2. Full dcache flush (I've ported this from u-boot to the hypervisor) - 93 uS

The difference is huge!

Does the "full dcache flush" cost 93 uS no matter the address range we
want to flush?

How long does it take to flush only the kernel, initramfs and DTB using
flush_xen_dcache_va_range?

It is probably worth sending a patch with your full dcache flush ported
from u-boot and start using that.

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