From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp121.iad3a.emailsrvr.com ([173.203.187.121]:36239 "EHLO smtp121.iad3a.emailsrvr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S978968AbdDYFd7 (ORCPT ); Tue, 25 Apr 2017 01:33:59 -0400 Received: from smtp24.relay.iad3a.emailsrvr.com (localhost [127.0.0.1]) by smtp24.relay.iad3a.emailsrvr.com (SMTP Server) with ESMTP id D1C8D24CAA for ; Tue, 25 Apr 2017 01:33:58 -0400 (EDT) Received: by smtp24.relay.iad3a.emailsrvr.com (Authenticated sender: intranet-AT-rqc.ru) with ESMTPSA id 814E024B90 for ; Tue, 25 Apr 2017 01:33:58 -0400 (EDT) Received: from CM01.administration.intranet.rqc.ru (unknown [10.101.2.94]) by postfix.thinky.servers.rqc.ru (Postfix) with ESMTPS id A7A91731D for ; Tue, 25 Apr 2017 05:33:55 +0000 (UTC) Subject: Re: Problem with file system To: linux-btrfs@vger.kernel.org References: <9871a669-141b-ac64-9da6-9050bcad7640@cn.fujitsu.com> From: Marat Khalili Message-ID: Date: Tue, 25 Apr 2017 08:33:55 +0300 MIME-Version: 1.0 In-Reply-To: <9871a669-141b-ac64-9da6-9050bcad7640@cn.fujitsu.com> Content-Type: text/plain; charset=utf-8; format=flowed Sender: linux-btrfs-owner@vger.kernel.org List-ID: On 25/04/17 03:26, Qu Wenruo wrote: > IIRC qgroup for subvolume deletion will cause full subtree rescan > which can cause tons of memory. Could it be this bad, 24GB of RAM for a 5.6TB volume? What does it even use this absurd amount of memory for? Is it swappable? Haven't read about RAM limitations for running qgroups before, only about CPU load (which importantly only requires patience, does not crash servers). -- With Best Regards, Marat Khalili