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Sat, 13 Jul 2024 23:03:16 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.11.0-alpha0-568-g843fbadbe-fm-20240701.003-g843fbadb Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <87209180-c09f-4536-b515-82e0ff260644@app.fastmail.com> In-Reply-To: <8223b782-5325-4628-b688-293b7f16c931@app.fastmail.com> References: <20240714-loongson64-cevt-r4k-v1-1-98afed7260aa@flygoat.com> <8223b782-5325-4628-b688-293b7f16c931@app.fastmail.com> Date: Sun, 14 Jul 2024 11:02:55 +0800 From: "Jiaxun Yang" To: "Huacai Chen" Cc: "Thomas Bogendoerfer" , "linux-mips@vger.kernel.org" , linux-kernel@vger.kernel.org Subject: Re: [PATCH] MIPS: Loongson64: Switch to SYNC_R4K Content-Type: text/plain;charset=utf-8 Content-Transfer-Encoding: quoted-printable =E5=9C=A82024=E5=B9=B47=E6=9C=8814=E6=97=A5=E4=B8=83=E6=9C=88 =E4=B8=8A=E5= =8D=8811:00=EF=BC=8CJiaxun Yang=E5=86=99=E9=81=93=EF=BC=9A > =E5=9C=A82024=E5=B9=B47=E6=9C=8814=E6=97=A5=E4=B8=83=E6=9C=88 =E4=B8=8A= =E5=8D=8810:54=EF=BC=8CHuacai Chen=E5=86=99=E9=81=93=EF=BC=9A >> On Sun, Jul 14, 2024 at 10:41=E2=80=AFAM Jiaxun Yang 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]:=20 > https://lore.kernel.org/linux-mips/20240511-mips-clks-v1-0-ddb4a10ee9f= 9@flygoat.com/ This is currently in mips-next. > > Thanks > - Jiaxun > >> >> Huacai > > > --=20 > - Jiaxun --=20 - Jiaxun