linux-kernel - Re: [PATCH] MIPS: Loongson64: Switch to SYNC

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Message-Id: <8223b782-5325-4628-b688-293b7f16c931@app.fastmail.com>
Date: Sun, 14 Jul 2024 11:00:23 +0800
From: "Jiaxun Yang" <jiaxun.yang@...goat.com>
To: "Huacai Chen" <chenhuacai@...nel.org>
Cc: "Thomas Bogendoerfer" <tsbogend@...ha.franken.de>,
 "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] MIPS: Loongson64: Switch to SYNC_R4K



在2024年7月14日七月 上午10:54，Huacai Chen写道：
> On Sun, Jul 14, 2024 at 10:41 AM Jiaxun Yang <jiaxun.yang@...goat.com> wrote:
>>
>> Nowadays SYNC_R4K is performing better than Loongson64's
>> custom sync mechanism.
> Loongson64's preciseness is significantly better than SYNC_R4K.

My updated implementation[1] uses a multi-pass regression methodology
which can compensite communication overhead. I had measured delta
with EJTAG DINT on Loongson-2K and it can be reduced to as low as 4
cycles while ASK_C0_COUNT has ~50 cycles delta.

[1]: https://lore.kernel.org/linux-mips/20240511-mips-clks-v1-0-ddb4a10ee9f9@flygoat.com/

Thanks
- Jiaxun

>
> Huacai


-- 
- Jiaxun