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From: "Suthikulpanit, Suravee" <Suravee.Suthikulpanit@amd.com>
To: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Mel Gorman <mgorman@techsingularity.net>,
	Peter Zijlstra <peterz@infradead.org>,
	"Lendacky, Thomas" <Thomas.Lendacky@amd.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Borislav Petkov <bp@alien8.de>
Subject: Re: [PATCH] sched/topology: Improve load balancing on AMD EPYC
Date: Mon, 22 Jul 2019 14:11:12 +0000	[thread overview]
Message-ID: <35845e45-0513-085f-9848-3dca92391c76@amd.com> (raw)
In-Reply-To: <20190628151508.GB6909@codeblueprint.co.uk>

Matt

On 6/28/2019 10:15 AM, Matt Fleming wrote:
> On Wed, 26 Jun, at 09:18:01PM, Suthikulpanit, Suravee wrote:
>>
>> We use 16 to designate 1-hop latency (for different node within the same socket).
>> For across-socket access, since the latency is greater, we set the latency to 32
>> (twice the latency of 1-hop) not aware of the RECLAIM_DISTANCE at the time.
>   
> I guess the question is: Is the memory latency of a remote node 1 hop
> away 1.6x the local node latency?
> 

Yes, remote node 1 hop is 1.6x the local node latency for AMD EPYC.

Suravee

      reply	other threads:[~2019-07-22 14:11 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-05 15:59 Matt Fleming
2019-06-05 18:00 ` Peter Zijlstra
2019-06-10 21:26   ` Matt Fleming
2019-06-11 17:22     ` Lendacky, Thomas
2019-06-18 10:43       ` Matt Fleming
2019-06-18 12:33         ` Peter Zijlstra
2019-06-19 21:34           ` Matt Fleming
2019-06-24 14:24             ` Mel Gorman
2019-06-26 21:18               ` Suthikulpanit, Suravee
2019-06-28 15:15                 ` Matt Fleming
2019-07-22 14:11                   ` Suthikulpanit, Suravee [this message]

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