From owner-freebsd-fs@freebsd.org  Fri Feb 19 19:09:13 2016
Return-Path: <owner-freebsd-fs@freebsd.org>
Delivered-To: freebsd-fs@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id B5E0EAAE00C
 for <freebsd-fs@mailman.ysv.freebsd.org>; Fri, 19 Feb 2016 19:09:13 +0000 (UTC)
 (envelope-from mwlucas@mail.michaelwlucas.com)
Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org
 [IPv6:2001:1900:2254:206a::50:5])
 by mx1.freebsd.org (Postfix) with ESMTP id A0B491CC9
 for <freebsd-fs@freebsd.org>; Fri, 19 Feb 2016 19:09:13 +0000 (UTC)
 (envelope-from mwlucas@mail.michaelwlucas.com)
Received: by mailman.ysv.freebsd.org (Postfix)
 id 9DCBFAAE00B; Fri, 19 Feb 2016 19:09:13 +0000 (UTC)
Delivered-To: fs@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 9D6E2AAE00A
 for <fs@mailman.ysv.freebsd.org>; Fri, 19 Feb 2016 19:09:13 +0000 (UTC)
 (envelope-from mwlucas@mail.michaelwlucas.com)
Received: from mail.michaelwlucas.com (mail.michaelwlucas.com
 [104.236.197.233])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id ADBFD1CC5
 for <fs@freebsd.org>; Fri, 19 Feb 2016 19:09:12 +0000 (UTC)
 (envelope-from mwlucas@mail.michaelwlucas.com)
Received: from mail.michaelwlucas.com (localhost [127.0.0.1])
 by mail.michaelwlucas.com (8.15.2/8.15.2) with ESMTP id u1JJ7rp1047520;
 Fri, 19 Feb 2016 14:07:54 -0500 (EST)
 (envelope-from mwlucas@mail.michaelwlucas.com)
Received: (from mwlucas@localhost)
 by mail.michaelwlucas.com (8.15.2/8.15.2/Submit) id u1JJ7rC4047519;
 Fri, 19 Feb 2016 14:07:53 -0500 (EST) (envelope-from mwlucas)
Date: Fri, 19 Feb 2016 14:07:53 -0500
From: "Michael W. Lucas" <mwlucas@michaelwlucas.com>
To: Tom Curry <thomasrcurry@gmail.com>
Cc: fs@freebsd.org
Subject: Re: dtracing ZFS on FreeBSD
Message-ID: <20160219190753.GA47502@mail.michaelwlucas.com>
References: <20160219180716.GA46881@mail.michaelwlucas.com>
 <CAGtEZUB31Uwk1Ge_DPB_scP6Sw6D4s-w6WgbXr_k_zDL0DB7dQ@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CAGtEZUB31Uwk1Ge_DPB_scP6Sw6D4s-w6WgbXr_k_zDL0DB7dQ@mail.gmail.com>
User-Agent: Mutt/1.5.24 (2015-08-30)
X-Spam-Status: No, score=0.0 required=5.0 tests=UNPARSEABLE_RELAY,
 URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.1
X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on
 mail.michaelwlucas.com
X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.4.3
 (mail.michaelwlucas.com [127.0.0.1]); Fri, 19 Feb 2016 14:07:55 -0500 (EST)
X-BeenThere: freebsd-fs@freebsd.org
X-Mailman-Version: 2.1.20
Precedence: list
List-Id: Filesystems <freebsd-fs.freebsd.org>
List-Unsubscribe: <https://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: <https://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
 <mailto:freebsd-fs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 19 Feb 2016 19:09:13 -0000

On Fri, Feb 19, 2016 at 01:51:21PM -0500, Tom Curry wrote:
>    For the variable drops you could try increasing the buffer size, I know
>    I ran into this when I was tracing something very noisy and it
>    definitely helped.
>    #pragma D option bufsize=1m

Cranking it up to the limit of 16m helps, thank you.

But the problem still appears during load, just not as often.

Any other suggestions, anyone?

==ml

-- 
Michael W. Lucas  -  mwlucas@michaelwlucas.com, Twitter @mwlauthor 
http://www.MichaelWLucas.com/, http://blather.MichaelWLucas.com/