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Re: [Qemu-devel] [PATCHv4 0/9] buffer_is_zero / migration optimizations
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCHv4 0/9] buffer_is_zero / migration optimizations |
Date: |
Tue, 26 Mar 2013 10:20:34 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130311 Thunderbird/17.0.4 |
Il 26/03/2013 09:14, Peter Lieven ha scritto:
> If noone objects I would use is_zero_page_2 and continue with v5 of
> the patch set. As I am ooo for the next 8 days from tomorrow. i
> prefer v3 as it has better performance if the non-zeroness is within
> the 8*sizeof(VECTYPE) bytes and not in the first 256-bit.
Either v2 or v3 is fine. v3 has slightly simpler code and v2 optimizes
for a rare case, but v2 is indeed a bit faster and your benchmarking
effort should be rewarded. :)
> Paolo, with the version that has lower setup costs in mind shall I
> use the vectorized or the unrolled version of patch 4 (find_next_bit
> optimization)?
I think for that we should, at least for now, use the version we
discussed a few weeks ago (with no SIMD and just unrolling).
Paolo
- Re: [Qemu-devel] [PATCHv4 0/9] buffer_is_zero / migration optimizations, (continued)
- Re: [Qemu-devel] [PATCHv4 0/9] buffer_is_zero / migration optimizations, Peter Lieven, 2013/03/23
- Re: [Qemu-devel] [PATCHv4 0/9] buffer_is_zero / migration optimizations, Peter Lieven, 2013/03/25
- Re: [Qemu-devel] [PATCHv4 0/9] buffer_is_zero / migration optimizations, Paolo Bonzini, 2013/03/25
- Re: [Qemu-devel] [PATCHv4 0/9] buffer_is_zero / migration optimizations, Peter Lieven, 2013/03/25
- Re: [Qemu-devel] [PATCHv4 0/9] buffer_is_zero / migration optimizations, Paolo Bonzini, 2013/03/25
- Re: [Qemu-devel] [PATCHv4 0/9] buffer_is_zero / migration optimizations, Peter Lieven, 2013/03/25
- Re: [Qemu-devel] [PATCHv4 0/9] buffer_is_zero / migration optimizations, Peter Lieven, 2013/03/25
- Re: [Qemu-devel] [PATCHv4 0/9] buffer_is_zero / migration optimizations, Paolo Bonzini, 2013/03/25
- Re: [Qemu-devel] [PATCHv4 0/9] buffer_is_zero / migration optimizations, Peter Lieven, 2013/03/25
- Re: [Qemu-devel] [PATCHv4 0/9] buffer_is_zero / migration optimizations, Peter Lieven, 2013/03/26
- Re: [Qemu-devel] [PATCHv4 0/9] buffer_is_zero / migration optimizations,
Paolo Bonzini <=