From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mailgw-02.dd24.net ([193.46.215.43]:36101 "EHLO mailgw-02.dd24.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934927AbdGTVxT (ORCPT ); Thu, 20 Jul 2017 17:53:19 -0400 Message-ID: <1500587596.7266.20.camel@scientia.net> Subject: Re: strange No space left on device issues From: Christoph Anton Mitterer To: Omar Sandoval Cc: linux-btrfs , Martin Raiber Date: Thu, 20 Jul 2017 23:53:16 +0200 In-Reply-To: <20170720214813.GE29924@vader.DHCP.thefacebook.com> References: <1500561549.7266.1.camel@scientia.net> <0102015d6083ffde-e6d15fd5-6e66-41a0-9ddf-af163c96ebd8-000000@eu-west-1.amazonses.com> <1500564013.7266.8.camel@scientia.net> <20170720173214.GA29924@vader.DHCP.thefacebook.com> <1500586436.7266.18.camel@scientia.net> <20170720214813.GE29924@vader.DHCP.thefacebook.com> Content-Type: multipart/signed; micalg="sha-512"; protocol="application/x-pkcs7-signature"; boundary="=-tW3v0S/M34zDYploleJT" Mime-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org List-ID: --=-tW3v0S/M34zDYploleJT Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2017-07-20 at 14:48 -0700, Omar Sandoval wrote: > Just to be sure, did you explicitly write 0 to these? Nope... that seemed to have been the default value, i.e. I used sysctl(8) in read (and not set) mode here. > These sysctls are > really confusing, see https://www.kernel.org/doc/Documentation/sysctl > /vm.txt. > Basically, there are two ways to specify these, either as a ratio of > system memory (vm.dirty_ratio and vm.dirty_background_ratio) or a > static > number of bytes (vm.dirty_bytes and vm.dirty_background_bytes). If > you > set one, the other appears as 0, and the kernel sets the ratios by > default. But if you explicitly set them to 0, the kernel is going to > flush stuff extremely aggressively. I see,... not sure why both are 0 here... at least I didn't change it myself - must be something from the distro? > Awesome, glad to hear it! I hadn't been able to reproduce the issue > outside of Facebook. Can I add your tested-by? Sure, but better use my other mail address for it, if you don't mind: Christoph Anton Mitterer > > I assume you'll take care to get that patch into stable kernels? > > Is this patch alone enough to recommend the Debian maintainers to > > include it into their 4.9 long term stable kernels? >=20 > I'll mark it for stable, assuming Debian tracks the upstream LTS > releases it should get in. Okay :-) Nevertheless I'll open a bug at their BTS, just to be safe. 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