From: Richard Henderson <richard.henderson@linaro.org>
To: Alexander Monakov <amonakov@ispras.ru>
Cc: qemu-devel@nongnu.org, mmromanov@ispras.ru
Subject: Re: [PATCH v4 00/10] Optimize buffer_is_zero
Date: Fri, 16 Feb 2024 12:28:09 -1000 [thread overview]
Message-ID: <6f9b69ba-f694-4c22-b6fc-110a96bb1ba8@linaro.org> (raw)
In-Reply-To: <b313b1e3-a8c7-a409-5a9f-ab9ce3853e40@ispras.ru>
On 2/16/24 10:20, Alexander Monakov wrote:
> FWIW, in situations like these I always recommend to run perf with fixed
> sampling rate, i.e. 'perf record -e cycles:P -c 100000' or 'perf record -e
> cycles/period=100000/P' to make sample counts between runs of different
> duration directly comparable (displayed with 'perf report -n').
I've re-done the numbers with fixed period, as suggested, and the difference between v3
and v4+ is in the sampling noise, differing about 0.3%.
r~
prev parent reply other threads:[~2024-02-16 22:29 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-15 8:14 [PATCH v4 00/10] Optimize buffer_is_zero Richard Henderson
2024-02-15 8:14 ` [PATCH v4 01/10] util/bufferiszero: Remove SSE4.1 variant Richard Henderson
2024-02-15 8:14 ` [PATCH v4 02/10] util/bufferiszero: Remove AVX512 variant Richard Henderson
2024-02-15 8:14 ` [PATCH v4 03/10] util/bufferiszero: Reorganize for early test for acceleration Richard Henderson
2024-02-15 8:14 ` [PATCH v4 04/10] util/bufferiszero: Remove useless prefetches Richard Henderson
2024-02-15 8:14 ` [PATCH v4 05/10] util/bufferiszero: Optimize SSE2 and AVX2 variants Richard Henderson
2024-02-15 8:14 ` [PATCH v4 06/10] util/bufferiszero: Improve scalar variant Richard Henderson
2024-02-15 8:14 ` [PATCH v4 07/10] util/bufferiszero: Introduce biz_accel_fn typedef Richard Henderson
2024-02-15 8:34 ` Philippe Mathieu-Daudé
2024-02-15 8:14 ` [PATCH v4 08/10] util/bufferiszero: Simplify test_buffer_is_zero_next_accel Richard Henderson
2024-02-15 8:40 ` Philippe Mathieu-Daudé
2024-02-15 8:14 ` [PATCH v4 09/10] util/bufferiszero: Add simd acceleration for aarch64 Richard Henderson
2024-02-15 8:47 ` Alexander Monakov
2024-02-15 17:47 ` Richard Henderson
2024-02-15 18:46 ` Alexander Monakov
2024-02-15 21:10 ` Richard Henderson
2024-02-15 8:14 ` [RFC PATCH v4 10/10] util/bufferiszero: Add sve " Richard Henderson
2024-02-16 9:33 ` Alex Bennée
2024-02-16 11:05 ` Alex Bennée
2024-02-15 8:57 ` [PATCH v4 00/10] Optimize buffer_is_zero Alexander Monakov
2024-02-15 21:16 ` Richard Henderson
2024-02-15 21:36 ` Alexander Monakov
2024-02-15 22:27 ` Richard Henderson
2024-02-15 23:37 ` Alexander Monakov
2024-02-16 8:11 ` Richard Henderson
2024-02-16 20:20 ` Alexander Monakov
2024-02-16 22:28 ` Richard Henderson [this message]
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