Messages in this thread | | | Date | Mon, 7 Dec 2020 23:14:33 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH v7] swiotlb: Adjust SWIOTBL bounce buffer size for SEV guests. |
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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.
Btw, pls trim the rest of the mail when you reply. Like I just did. There's no need to leave text which you're not responding to, quoted.
Thx.
-- Regards/Gruss, Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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