> On Dec 7, 2020, at 4:14 PM, Borislav Petkov <b...@alien8.de> wrote: > > On Mon, Dec 07, 2020 at 10:06:24PM +0000, Ashish Kalra wrote: >> This is related to the earlier static adjustment of the SWIOTLB buffers >> as per guest memory size and Konrad's feedback on the same, as copied >> below : >> >>>> That is eating 128MB for 1GB, aka 12% of the guest memory allocated >>>> statically for this. >>>> >>>> And for guests that are 2GB, that is 12% until it gets to 3GB when >>>> it is 8% and then 6% at 4GB. >>>> >>>> I would prefer this to be based on your memory count, that is 6% of >>>> total memory. > > So no rule of thumb and no measurements? Just a magic number 6.
It is more of an approximation of the earlier static adjustment which was 128M for <1G guests, 256M for 1G-4G guests and 512M for >4G guests. Thanks, Ashish
