From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk0-f169.google.com (mail-qk0-f169.google.com [209.85.220.169]) by kanga.kvack.org (Postfix) with ESMTP id 96A7D6B0253 for ; Mon, 24 Aug 2015 16:12:27 -0400 (EDT) Received: by qkfh127 with SMTP id h127so86133847qkf.1 for ; Mon, 24 Aug 2015 13:12:27 -0700 (PDT) Received: from na01-bn1-obe.outbound.protection.outlook.com (mail-bn1bon0090.outbound.protection.outlook.com. [157.56.111.90]) by mx.google.com with ESMTPS id 107si29940815qgz.36.2015.08.24.13.12.26 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 24 Aug 2015 13:12:26 -0700 (PDT) From: James Hartshorn Subject: Can we disable transparent hugepages for lack of a legitimate use case please? Date: Mon, 24 Aug 2015 20:12:24 +0000 Message-ID: Content-Language: en-US Content-Type: multipart/alternative; boundary="_000_BLUPR02MB1698DD8F0D1550366489DF8CCD620BLUPR02MB1698namp_" MIME-Version: 1.0 Sender: owner-linux-mm@kvack.org List-ID: To: "linux-mm@kvack.org" --_000_BLUPR02MB1698DD8F0D1550366489DF8CCD620BLUPR02MB1698namp_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi, I've been struggling with transparent hugepage performance issues, and can'= t seem to find anyone who actually uses it intentionally. Virtually every = database that runs on linux however recommends disabling it or setting it t= o madvise. I'm referring to: /sys/kernel/mm/transparent_hugepage/enabled I asked on the internet http://unix.stackexchange.com/questions/201906/does= -anyone-actually-use-and-benefit-from-transparent-huge-pages and got no res= ponses there. Independently I noticed "sysctl: The scan_unevictable_pages sysctl/node-interface has been disabled= for lack of a legitimate use case. If you have one, please send an email = to linux-mm@kvack.org." And thought wow that's exactly what should be done to transparent hugepages= . Thoughts? --_000_BLUPR02MB1698DD8F0D1550366489DF8CCD620BLUPR02MB1698namp_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi,

I've been struggling with transparent hugepage performance issues, and c= an't seem to find anyone who actually uses it intentionally. Virtuall= y every database that runs on linux however recommends disabling it or sett= ing it to madvise. I'm referring to:

/sys/kernel/mm/transparent_hugepage/enabled

I asked on the internet http://unix.stackexchange.com/que= stions/201906/does-anyone-actually-use-and-benefit-from-transparent-huge-pa= ges and got no responses there.

Independently I noticed

"sysctl: The scan_unevictable_pages sysctl/node-interface has been = disabled for lack of a legitimate use case. If you have one, please s= end an email to linux-mm@kvack.org."

And thought wow that's exactly what should be done to transparent hugepa= ges.

Thoughts?

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