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Re: [Qemu-trivial] [Qemu-devel] [PATCH] tcg: optimise memory layout of T

From: Stefan Weil
Subject: Re: [Qemu-trivial] [Qemu-devel] [PATCH] tcg: optimise memory layout of TCGTemp
Date: Mon, 30 Mar 2015 07:43:45 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.5.0

Am 29.03.2015 um 23:52 schrieb Richard Henderson:
No decrease in boot time is good. We /know/ we're saving memory, after all.

Well, I would not mind a decrease in boot time, too.
The more it decreases, the better. :-)

To be honest: in my version I only used 1 bit bitfield entries for
boolean values, but 8 bit values (aligned on byte boundaries)
for other values because as far as I know, most (all?) cpu
architectures will need more time to extract some bits from
a machine word than to extract a byte.

I have no idea whether this makes a difference in performance
as I did not run any runtime benchmark.


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