From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-la0-f41.google.com (mail-la0-f41.google.com [209.85.215.41]) by kanga.kvack.org (Postfix) with ESMTP id 1B5E96B0082 for ; Sat, 14 Mar 2015 13:24:17 -0400 (EDT) Received: by ladw1 with SMTP id w1so11546845lad.0 for ; Sat, 14 Mar 2015 10:24:16 -0700 (PDT) Received: from shrek.krogh.cc (188-178-198-210-static.dk.customer.tdc.net. [188.178.198.210]) by mx.google.com with ESMTPS id j17si3915800lbh.5.2015.03.14.10.24.14 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 14 Mar 2015 10:24:15 -0700 (PDT) Message-ID: In-Reply-To: References: <52ec58f434865829c37337624d124981.squirrel@shrek.krogh.cc> Date: Sat, 14 Mar 2015 18:25:19 +0100 Subject: Re: High system load and 3TB of memory. From: jesper@krogh.cc MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org List-ID: To: Andrey Korolyov Cc: jesper@krogh.cc, linux-mm@kvack.org > On Sat, Mar 14, 2015 at 8:05 PM, wrote: >> Hi >> I have a 3.13 (ubuntu LTS) server with 3TB of memory and under certain >> load >> conditions it can spiral off to 80+% system load. Per recommendation on >> IRC >> yesterday I have captured 2 perf reports (I'm new to perf, so I'm not >> sure they tell precisely whats needed. >> >> Bad situation (high sysload 80%+) > Hi Jesper, please take a look on > http://marc.info/?l=linux-mm&m=141605213522925&w=2, there is a long > and unfinished discussion as it seems very problematic to make a > deterministic reproduction of the bug in our environments. If you can > observe same lockups with more ease, it`ll help a lot in the issue > pinning and fixing. Hi Andrey. Yes it looks indeed familiar. I can do a fair amount of testing and our normal production load triggers the problem 6-10 times per day and I'm willing to garther data to help move forward. What do you suggest is next? Jesper -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org