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From: Richard Henderson <richard.henderson@linaro.org>
To: Alexander Monakov <amonakov@ispras.ru>, qemu-devel@nongnu.org
Cc: Mikhail Romanov <mmromanov@ispras.ru>,
	Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [PATCH v3 5/6] util/bufferiszero: optimize SSE2 and AVX2 variants
Date: Wed, 7 Feb 2024 09:10:03 +1000	[thread overview]
Message-ID: <478af5cc-2eee-4d7d-9417-8e6af372f7c5@linaro.org> (raw)
In-Reply-To: <20240206204809.9859-6-amonakov@ispras.ru>

On 2/7/24 06:48, Alexander Monakov wrote:
> Increase unroll factor in SIMD loops from 4x to 8x in order to move
> their bottlenecks from ALU port contention to load issue rate (two loads
> per cycle on popular x86 implementations).

Ah, that answers my question re 128 vs 256 byte minimum.

So as far as this patch goes,
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>


r~


  reply	other threads:[~2024-02-06 23:11 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-02-06 20:48 [PATCH v3 0/6] Optimize buffer_is_zero Alexander Monakov
2024-02-06 20:48 ` [PATCH v3 1/6] util/bufferiszero: remove SSE4.1 variant Alexander Monakov
2024-02-06 22:24   ` Richard Henderson
2024-02-06 20:48 ` [PATCH v3 2/6] util/bufferiszero: introduce an inline wrapper Alexander Monakov
2024-02-06 22:44   ` Richard Henderson
2024-02-07  7:13     ` Alexander Monakov
2024-02-08 20:07       ` Richard Henderson
2024-02-06 20:48 ` [PATCH v3 3/6] util/bufferiszero: remove AVX512 variant Alexander Monakov
2024-02-06 22:28   ` Richard Henderson
2024-02-06 23:56   ` Elena Ufimtseva
2024-02-07  6:29     ` Alexander Monakov
2024-02-07 10:38       ` Joao Martins
2024-02-06 20:48 ` [PATCH v3 4/6] util/bufferiszero: remove useless prefetches Alexander Monakov
2024-02-06 22:29   ` Richard Henderson
2024-02-06 20:48 ` [PATCH v3 5/6] util/bufferiszero: optimize SSE2 and AVX2 variants Alexander Monakov
2024-02-06 23:10   ` Richard Henderson [this message]
2024-02-06 20:48 ` [PATCH v3 6/6] util/bufferiszero: improve scalar variant Alexander Monakov
2024-02-06 22:34   ` Richard Henderson
2024-02-06 22:46     ` Richard Henderson

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