From owner-freebsd-scsi@FreeBSD.ORG  Fri Jun 23 15:52:24 2006
Return-Path: <owner-freebsd-scsi@FreeBSD.ORG>
X-Original-To: freebsd-scsi@freebsd.org
Delivered-To: freebsd-scsi@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 8570216A47C
	for <freebsd-scsi@freebsd.org>; Fri, 23 Jun 2006 15:52:24 +0000 (UTC)
	(envelope-from arcade@synergetica.dn.ua)
Received: from nora.synergetica.dn.ua (synergetica.dn.ua [82.207.115.117])
	by mx1.FreeBSD.org (Postfix) with ESMTP id BA84C43D46
	for <freebsd-scsi@freebsd.org>; Fri, 23 Jun 2006 15:52:23 +0000 (GMT)
	(envelope-from arcade@synergetica.dn.ua)
Received: from [172.30.0.209] (yarn.lan [172.30.0.209]) (authenticated bits=0)
	by nora.synergetica.dn.ua (8.13.7/8.13.7) with ESMTP id k5NFqLqd004922; 
	Fri, 23 Jun 2006 18:52:21 +0300 (EEST)
	(envelope-from arcade@synergetica.dn.ua)
Message-ID: <449C0E34.3080005@synergetica.dn.ua>
Date: Fri, 23 Jun 2006 18:52:20 +0300
From: Volodymyr Kostyrko <arcade@synergetica.dn.ua>
User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; ru-RU;
	rv:1.8.0.4) Gecko/20060605 SeaMonkey/1.0.2
MIME-Version: 1.0
To: "Justin T. Gibbs" <gibbs@scsiguy.com>
References: <4499B748.6040805@synergetica.dn.ua>
	<90D11403BD2140875BFEB24D@[10.0.0.22]>
In-Reply-To: <90D11403BD2140875BFEB24D@[10.0.0.22]>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
Cc: freebsd-scsi@freebsd.org
Subject: Re: ahd(4) poor performance
X-BeenThere: freebsd-scsi@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: SCSI subsystem <freebsd-scsi.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-scsi>,
	<mailto:freebsd-scsi-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-scsi>
List-Post: <mailto:freebsd-scsi@freebsd.org>
List-Help: <mailto:freebsd-scsi-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-scsi>,
	<mailto:freebsd-scsi-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 23 Jun 2006 15:52:24 -0000

Justin T. Gibbs пишет:
> --On Thursday, June 22, 2006 12:16 AM +0300 Volodymyr Kostyrko 
> <arcade@synergetica.dn.ua> wrote:
> 
>> Hi all.
>>
>>    I have:
>>
>> ahd0: <Adaptec (Dell OEM) 39320 Ultra320 SCSI adapter> port
>> 0xdc00-0xdcff,0xd800-0xd8ff mem 0xdfbfe000-0xdfbfffff irq 66 at device
>> 7.0 on pci3
>> ahd0: [GIANT-LOCKED]
>> aic7902: Ultra320 Wide Channel A, SCSI Id=7, PCI-X 101-133Mhz, 512 SCBs
>> ahd1: <Adaptec (Dell OEM) 39320 Ultra320 SCSI adapter> port
>> 0xd400-0xd4ff,0xd000-0xd0ff mem 0xdfbfc000-0xdfbfdfff irq 67 at device
>> 7.1 on pci3
>> ahd1: [GIANT-LOCKED]
>> aic7902: Ultra320 Wide Channel B, SCSI Id=7, PCI-X 101-133Mhz, 512 SCBs
>>
>>    Booting machine also results in:
>>
>> ahd0: Invalid Sequencer interrupt occurred.
> 
> This error is benign.
> 
> There have been issues reported with some recent Seagate drives and
> large queue depths.  You may get better performance if you use camcontrol
> to lower the queue depth to 63 or 32.  I believe that 32 is the default
> used by Linux.
> 
> -- 
> Justin

   Interesting.

   By default I have the following:

srv4# camcontrol tags 0:0 -v
(pass1:ahd0:0:1:0): dev_openings  1
(pass1:ahd0:0:1:0): dev_active    0
(pass1:ahd0:0:1:0): devq_openings 1
(pass1:ahd0:0:1:0): devq_queued   0
(pass1:ahd0:0:1:0): held          0
(pass1:ahd0:0:1:0): mintags       2
(pass1:ahd0:0:1:0): maxtags       255

   Raising this to higher values provides better perfomance:

@1:

 > dd if=/dev/zero of=somefile count=20480
20480+0 records in
20480+0 records out
10485760 bytes transferred in 1.114188 secs (9411123 bytes/sec)

@2:

 > dd if=/dev/zero of=somefile count=20480
20480+0 records in
20480+0 records out
10485760 bytes transferred in 0.402884 secs (26026747 bytes/sec)

   Raising it further doesn't help anyway. And it still behaves not so 
fast as Linux.

-- 
[WBR], Arcade.