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From: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
To: 'GNU C Library' <libc-alpha@sourceware.org>
Cc: "wangshuo (AF)" <wangshuo47@huawei.com>
Subject: [PATCH] aarch64: revert memcpy optimze for kunpeng to avoid performance degradation
Date: Wed, 20 Jan 2021 14:49:54 +0000	[thread overview]
Message-ID: <VE1PR08MB5599F1B24DFFC1C15CB79C5483A20@VE1PR08MB5599.eurprd08.prod.outlook.com> (raw)

Hi Shuo,

Have you tried running the GLIBC memcpy benchmarks? These should give a
decent comparison between all the memcpy variants. It might be that the new
__memcy_simd is better than the generic variant (these are backported to 2.28).

Note that 99% of memcpies are less than 1000 bytes, so it's best to focus on small
copy performance.

Cheers,
Wilco

             reply	other threads:[~2021-01-20 14:50 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-20 14:49 Wilco Dijkstra [this message]
  -- strict thread matches above, loose matches on Subject: below --
2021-01-22  1:26 Shuo Wang
2021-01-21  1:55 Zhangxuelei (Derek)
2021-01-21 16:41 ` Adhemerval Zanella
2021-01-21 16:45   ` Szabolcs Nagy
2021-01-20  9:35 Shuo Wang
2021-01-20  9:34 Shuo Wang
2021-01-20  7:20 Shuo Wang
2021-01-20 13:09 ` Adhemerval Zanella

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