From owner-freebsd-fs@FreeBSD.ORG  Mon Mar 30 16:03:50 2015
Return-Path: <owner-freebsd-fs@FreeBSD.ORG>
Delivered-To: freebsd-fs@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 824F979B
 for <freebsd-fs@freebsd.org>; Mon, 30 Mar 2015 16:03:50 +0000 (UTC)
Received: from smtp40.i.mail.ru (smtp40.i.mail.ru [94.100.177.100])
 (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id EC1BE84D
 for <freebsd-fs@freebsd.org>; Mon, 30 Mar 2015 16:03:49 +0000 (UTC)
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mail.ru;
 s=mail2; 
 h=Content-Transfer-Encoding:Content-Type:In-Reply-To:References:Subject:To:MIME-Version:From:Date:Message-ID;
 bh=89NKfQwkV17ifjc+5ihp5RuC0m+Xrcimsb5ot/Dl+Hc=; 
 b=QYLjVxY6fozQF6VfCqDwvCgVYeybDFTNl5POHjtC23PfWoF3K2qbLHuVVJ99NNxrBZ8mIto6cdpb8icE2qSpUBraEFX24SUb/VW/Z9swb+tE8yhHGWIftvD6fOM6hgFWqpebiXLEB1y8GME1lLA4TXvmpYibcfC+6WUCCVE+OLY=;
Received: from [109.188.127.13] (port=56181 helo=[192.168.0.12])
 by smtp40.i.mail.ru with esmtpa (envelope-from <artem@artem.ru>)
 id 1YccAE-0007CW-5x
 for freebsd-fs@freebsd.org; Mon, 30 Mar 2015 19:03:46 +0300
Message-ID: <5519740A.1070902@artem.ru>
Date: Mon, 30 Mar 2015 19:04:26 +0300
From: Artem Kuchin <artem@artem.ru>
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64;
 rv:31.0) Gecko/20100101 Thunderbird/31.5.0
MIME-Version: 1.0
To: freebsd-fs@freebsd.org
Subject: Re: Little research how rm -rf and tar kill server
References: <55170D9C.1070107@artem.ru>
 <1427727936.293597.247070269.5CE0D411@webmail.messagingengine.com>
 <55196FC7.8090107@artem.ru>
 <1427730597.303984.247097389.165D5AAB@webmail.messagingengine.com>
 <5519716F.6060007@artem.ru>
 <1427731061.306961.247099633.0A421E90@webmail.messagingengine.com>
In-Reply-To: <1427731061.306961.247099633.0A421E90@webmail.messagingengine.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
X-Spam: Not detected
X-Mras: Ok
X-BeenThere: freebsd-fs@freebsd.org
X-Mailman-Version: 2.1.18-1
Precedence: list
List-Id: Filesystems <freebsd-fs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-fs>,
 <mailto:freebsd-fs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-fs/>
List-Post: <mailto:freebsd-fs@freebsd.org>
List-Help: <mailto:freebsd-fs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
 <mailto:freebsd-fs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 30 Mar 2015 16:03:50 -0000

30.03.2015 18:57, Mark Felder пишет:
>
> On Mon, Mar 30, 2015, at 10:53, Artem Kuchin wrote:
>> This is normal state, not under rm -rf
>> Do you need it during  rm -rf  ?
>>
> No, but I wonder if changing the timer from LAPIC to HPET or possibly
> one of the other timers makes the system more responsive under that
> load. Would you mind testing that?
>
> You can switch the timer like this:
>
> sysctl kern.eventtimer.timer=HPET
>
> And then run some of your I/O tests
>

I see. I will test at night, when load goes down.
I cannot say sure that's a right  way to dig, but i will test anything :)

Just to remind: untar overloads the system, but untar + sync every 120s 
does not.
That seems very strange to me.  I think the problem might be somewhere here.

Artem