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a="266867776" X-IronPort-AV: E=Sophos;i="5.83,229,1616482800"; d="scan'208";a="266867776" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 May 2021 09:17:44 -0700 IronPort-SDR: Ob+vocMUn0vIVMxr3+HzLdr9KZ1s3a+g+7hQqYg2H+yQ6Pjp47f/h77mkoNSN8L6USENL/3y/a APk+NyX7QZFw== X-IronPort-AV: E=Sophos;i="5.83,229,1616482800"; d="scan'208";a="481098275" Received: from yihleong-mobl.amr.corp.intel.com (HELO [10.255.228.69]) ([10.255.228.69]) by fmsmga002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 May 2021 09:17:44 -0700 Subject: Re: [PATCH 0/6 v2] Calculate pcp->high based on zone sizes and active CPUs To: Mel Gorman Cc: Andrew Morton , Hillf Danton , Dave Hansen , Vlastimil Babka , Michal Hocko , LKML , Linux-MM , "Tang, Feng" References: <20210525080119.5455-1-mgorman@techsingularity.net> <7177f59b-dc05-daff-7dc6-5815b539a790@intel.com> <20210528085545.GJ30378@techsingularity.net> <893ce8ed-df14-612b-693f-48c9dac0eb19@intel.com> <20210528151834.GR30378@techsingularity.net> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210528151834.GR30378@techsingularity.net> Content-Type: text/plain; charset=iso-8859-15 Content-Language: en-US Authentication-Results: imf20.hostedemail.com; dkim=none; dmarc=fail reason="No valid SPF, No valid DKIM" header.from=intel.com (policy=none); spf=none (imf20.hostedemail.com: domain of dave.hansen@intel.com has no SPF policy when checking 134.134.136.100) smtp.mailfrom=dave.hansen@intel.com X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: DB3E4541 X-Stat-Signature: dhkp7g1j1r5gjr8r3334bj3zyfair1ua X-HE-Tag: 1622218654-650502 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 5/28/21 8:18 AM, Mel Gorman wrote: >> BTW, to do some of this testing, Feng was doing a plain old kernel >> build. On the one system where this got run, he noted a ~2% regressio= n >> in build times. Nothing major, but you might want to be on the lookou= t >> in case 0day or the other test harnesses find something similar once >> this series gets to them. >> > What type of system was it? >=20 > I noticed minor differences for some thread counts on kernel compilatio= ns > but for CascadeLake at least, it was mostly neutral. Below is an old te= st > result based on a previous revision. It's a Cascade Lake as well. But, I never trust hardware at a hardware company. These could be preproduction CPUs or BIOS or both, or have some bonkers configuration knob flipped. It's also got a bunch of PMEM plugged and onlined, including the _possibility_ of kernel data structures ended up on PMEM. They *mostly* don't end up there, but it does happen on occasion. Anyway, I'll see if we can do some more runs with your latest version. It looks like it's been picked up for -mm so 0day should be pounding on it soon enough.