From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Wheeler Subject: Re: bcache and load average Date: Fri, 15 May 2015 10:55:32 -0700 (PDT) Message-ID: References: <20150515185032.6b129595@harpe.intellique.com> Mime-Version: 1.0 Content-Type: MULTIPART/MIXED; BOUNDARY="1866506367-117624659-1431712533=:8760" Return-path: Received: from homie.mail.dreamhost.com ([208.97.132.208]:40104 "EHLO homiemail-a2.g.dreamhost.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751919AbbEORze (ORCPT ); Fri, 15 May 2015 13:55:34 -0400 In-Reply-To: <20150515185032.6b129595@harpe.intellique.com> Sender: linux-bcache-owner@vger.kernel.org List-Id: linux-bcache@vger.kernel.org To: Emmanuel Florac Cc: linux-bcache@vger.kernel.org This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --1866506367-117624659-1431712533=:8760 Content-Type: TEXT/PLAIN; charset=US-ASCII > Going through various forum messages and bug reports (for Debian: > https://lists.debian.org/debian-kernel/2015/03/msg00060.html for Arch: > https://bugs.archlinux.org/task/38843 for some other distro: > https://groups.google.com/forum/#!msg/esos-users/NXp8tG7sVE8/QXZyPdZ2saIJ > ) it looks like the bcache_writeback kernel thread, being in > uninterruptible sleep, keeps the load average at 1.0 (or maybe more) > always. Could you please confirm this ? Try the attached patches that I've been collecting over the past year or two. I do not believe they have been merged into mainline (BUT SOMEONE NEEDS TO). I am not sure that these address the load bug, but if the load is being increased by a large amount of dmesg output caused by rcu traces, then the patches will help. -Eric > > - this behaviour should be described in the bcache documentation > because it feels to me (and many other) like a true gotcha. It's > apparently completely undocumented. A "CAVEATS" section at the > bottom of bcache.txt in the kernel Documentation explaining this > would be nice, what do you think? > > - Is there any way around this? Some people seem to grow uneasy (maybe > irrationnally) having a constant load on an otherwise unused system > (I know that a sleeping thread actually does nothing, but many > system administrators can't wrap their head around this idea). > > I've tried some advice I've found on the web, like switching to > writethrough and "echo 0 > /sys/block/bcache0/bcache/writeback_running" > but to absolutely no effect. > > Any advice and idea is welcome :) > > -- > ------------------------------------------------------------------------ > Emmanuel Florac | Direction technique > | Intellique > | > | +33 1 78 94 84 02 > ------------------------------------------------------------------------ > -- > To unsubscribe from this list: send the line "unsubscribe linux-bcache" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > --1866506367-117624659-1431712533=:8760 Content-Type: TEXT/x-diff; 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