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Wed, 15 Jan 2025 19:06:28 +0800 From: "Huang, Ying" To: Nikhil Dhama Cc: , , , , , , , , Subject: Re: [FIX PATCH] mm: pcp: fix pcp->free_count reduction on page allocation In-Reply-To: <20250109114230.24203-1-nikhil.dhama@amd.com> (Nikhil Dhama's message of "Thu, 9 Jan 2025 17:12:29 +0530") References: <20250107210506.3336da0da4332002847c89a3@linux-foundation.org> <20250109114230.24203-1-nikhil.dhama@amd.com> Date: Wed, 15 Jan 2025 19:06:21 +0800 Message-ID: <87wmew72vm.fsf@DESKTOP-5N7EMDA> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain; charset=ascii X-Rspam-User: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: E0F25C0011 X-Stat-Signature: 5xb5uapk8rhyreh1rgrzj4hrskshzi9f X-HE-Tag: 1736939192-705339 X-HE-Meta: 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 bbMO9rW4 T03UU2mwVx/DsX8xwspivXriQx/L+iPTsXbjr6DZ6QS8p+fHDlC8l6HPNI7cbMrKVPPrc/g5vt06uBJVmNOcvcbgsWWlXpWjaeB2DY+upxJIXAsyUyNj84RwxNk0Ir90wPmdFwyN00LUfA6R1yoL6bbUD+NI2TkMKyhPO2qQR/CSF8jzu6avGtsV4hvTNysxRChZ7ilbTZbqKpvq/Y4yVuqx6Y/SReMedbaPUeXNDD00nR80e76elvAIb3IPWxQboxbrL7vKA5Qv1aGqb3iJPX0LPQTd3dZElsSWPJlyyftLzUZ89wXMR+/r01y3eDKzVcGT1bnXigsKDexn1AKokZARgrH21zCvQdKf6 X-Bogosity: Ham, tests=bogofilter, spamicity=0.113475, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Nikhil Dhama writes: >> The present division by two appears to be somewhat randomly chosen. >> And as far as I can tell, this patch proposes replacing that with >> another somewhat random adjustment. >> >> What's the actual design here? What are we attempting to do and why, >> and why is the proposed design superior to the present one? > > We are further analyzing both the designs and their impact on pcp list. > > >> Nice, but might other workloads on other machines get slower? > > We are studying the impact of this on other network workloads like netperf, > and will post those results soon. To tune this parameter, in addition to network workloads, other kinds of workloads need be evaluated too. --- Best Regards, Huang, Ying