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Re: [Qemu-devel] [RFC][PATCH v4 3/3] tcg: Optimize qemu_ld/st by generat


From: Yeongkyoon Lee
Subject: Re: [Qemu-devel] [RFC][PATCH v4 3/3] tcg: Optimize qemu_ld/st by generating slow paths at the end of a block
Date: Tue, 28 Aug 2012 15:52:08 +0900
User-agent: Mozilla/5.0 (X11; Linux i686; rv:13.0) Gecko/20120615 Thunderbird/13.0.1


It's been a long time.

I've tested the performances of one jump difference when fast qemu_ld/st
(TLB hit).
The result shows 3.6% CoreMark enhancement when reducing one jump where slow
paths are generated at the end of block as same for the both cases.
That means reducing one jump dominates the majority of performance
enhancement from LDST_OPTIMIZATION.
As a result, it needs extended MMU helper functions for attaining that
performance rising, and those extended functions are used only implicitly.

BTW, who will finally confirm my patches?
I have sent four version of my patches in which I have applied all the
reasonable feedbacks from this community.
Currently, v4 is the final candidate though it might need merge with latest
HEAD because it was sent 1 month before.
I think the patches should be applied when 1.3 development opens.


Thanks for your reply.
How do you estimate when 1.3 development is open?





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