NetBSD Problem Report #48178

From www@NetBSD.org  Wed Sep  4 06:17:08 2013
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Message-Id: <20130904061706.C2ED6710C4@mollari.NetBSD.org>
Date: Wed,  4 Sep 2013 06:17:06 +0000 (UTC)
From: kolbycrouch@gmail.com
Reply-To: kolbycrouch@gmail.com
To: gnats-bugs@NetBSD.org
Subject: Extremely slow disk read/write
X-Send-Pr-Version: www-1.0

>Number:         48178
>Category:       kern
>Synopsis:       Extremely slow disk read/write
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          feedback
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Sep 04 06:20:01 +0000 2013
>Closed-Date:    
>Last-Modified:  Thu Sep 12 14:43:39 +0000 2019
>Originator:     Kolby Crouch
>Release:        6.99.23
>Organization:
NA
>Environment:
NetBSD 6.99.23 GENERIC AMD64
>Description:
On NetBSD-current my disk speeds are terribly slow on 2 different machines. on one of the machines, running STABLE is the solution, but the other machine has new hardware which I want to test with current. I've tried formatting the disk as ffs1 and ffs2, used noatime and log options at mount, neither works. With log turned on, speeds "seem" good at first until the system freezes for a moment to catch up with the log. At this rate pkgsrc takes around 1+ hour to extract, many times longer than on any other system I have tried (OpenBSD, FreeBSD, DragonFly, Linux) 
>How-To-Repeat:
N/A
>Fix:
Use stable :)

>Release-Note:

>Audit-Trail:
From: David Holland <dholland-bugs@netbsd.org>
To: gnats-bugs@NetBSD.org
Cc: 
Subject: Re: kern/48178: Extremely slow disk read/write
Date: Wed, 4 Sep 2013 06:23:03 +0000

 On Wed, Sep 04, 2013 at 06:20:01AM +0000, kolbycrouch@gmail.com wrote:
  > On NetBSD-current my disk speeds are terribly slow on 2 different
  > machines. on one of the machines, running STABLE is the solution,
  > but the other machine has new hardware which I want to test with
  > current. I've tried formatting the disk as ffs1 and ffs2, used
  > noatime and log options at mount, neither works. With log turned
  > on, speeds "seem" good at first until the system freezes for a
  > moment to catch up with the log. At this rate pkgsrc takes around
  > 1+ hour to extract, many times longer than on any other system I
  > have tried (OpenBSD, FreeBSD, DragonFly, Linux)

 You'll need to tell us a bit more, like what disk controllers and
 other related hardware are involved.

 -- 
 David A. Holland
 dholland@netbsd.org

From: Kolby Crouch <kolbycrouch@gmail.com>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: kern/48178
Date: Wed, 4 Sep 2013 06:39:24 +0000

 --001a1132fb9af7a01c04e589107e
 Content-Type: text/plain; charset=ISO-8859-1

 I should have said this, but It's the generic AHCI driver, I have also
 tried setting my SATA mode to IDE in the bios to see if pciide would work
 better. There is no apparent difference in performance, and other machines
 that also use the generic AHCI driver aren't necessarily effected by it.

 --001a1132fb9af7a01c04e589107e
 Content-Type: text/html; charset=ISO-8859-1
 Content-Transfer-Encoding: quoted-printable

 <div dir=3D"ltr"><span style=3D"font-family:arial,sans-serif;font-size:13px=
 ">I should have said this, but It&#39;s the generic AHCI driver, I have als=
 o tried setting my SATA mode to IDE in the bios to see if pciide would work=
  better. There is no apparent difference in performance, and other machines=
  that also use the generic AHCI driver aren&#39;t necessarily effected by i=
 t.</span><br>
 </div>

 --001a1132fb9af7a01c04e589107e--

From: Manuel Bouyer <bouyer@antioche.eu.org>
To: gnats-bugs@NetBSD.org
Cc: kern-bug-people@NetBSD.org, gnats-admin@NetBSD.org, netbsd-bugs@NetBSD.org,
        kolbycrouch@gmail.com
Subject: Re: kern/48178
Date: Wed, 4 Sep 2013 09:23:52 +0200

 On Wed, Sep 04, 2013 at 06:40:01AM +0000, Kolby Crouch wrote:
 > The following reply was made to PR kern/48178; it has been noted by GNATS.
 > 
 > From: Kolby Crouch <kolbycrouch@gmail.com>
 > To: gnats-bugs@netbsd.org
 > Cc: 
 > Subject: Re: kern/48178
 > Date: Wed, 4 Sep 2013 06:39:24 +0000
 > 
 >  --001a1132fb9af7a01c04e589107e
 >  Content-Type: text/plain; charset=ISO-8859-1
 >  
 >  I should have said this, but It's the generic AHCI driver, I have also
 >  tried setting my SATA mode to IDE in the bios to see if pciide would work
 >  better. There is no apparent difference in performance, and other machines
 >  that also use the generic AHCI driver aren't necessarily effected by it.


 Can you post the dmesg ?
 Also, the output of
 systat vm
 while disk I/O is in progress could help.

 -- 
 Manuel Bouyer <bouyer@antioche.eu.org>
      NetBSD: 26 ans d'experience feront toujours la difference
 --

From: Greg Oster <oster@cs.usask.ca>
To: gnats-bugs@NetBSD.org
Cc: 
Subject: Re: kern/48178: Extremely slow disk read/write
Date: Wed, 4 Sep 2013 07:58:01 -0600

 On Wed,  4 Sep 2013 06:25:00 +0000 (UTC)
 David Holland <dholland-bugs@netbsd.org> wrote:

 > The following reply was made to PR kern/48178; it has been noted by
 > GNATS.
 > 
 > From: David Holland <dholland-bugs@netbsd.org>
 > To: gnats-bugs@NetBSD.org
 > Cc: 
 > Subject: Re: kern/48178: Extremely slow disk read/write
 > Date: Wed, 4 Sep 2013 06:23:03 +0000
 > 
 >  On Wed, Sep 04, 2013 at 06:20:01AM +0000, kolbycrouch@gmail.com
 > wrote:
 >   > On NetBSD-current my disk speeds are terribly slow on 2 different
 >   > machines. on one of the machines, running STABLE is the solution,
 >   > but the other machine has new hardware which I want to test with
 >   > current. I've tried formatting the disk as ffs1 and ffs2, used
 >   > noatime and log options at mount, neither works. With log turned
 >   > on, speeds "seem" good at first until the system freezes for a
 >   > moment to catch up with the log. At this rate pkgsrc takes around
 >   > 1+ hour to extract, many times longer than on any other system I
 >   > have tried (OpenBSD, FreeBSD, DragonFly, Linux)
 >  
 >  You'll need to tell us a bit more, like what disk controllers and
 >  other related hardware are involved.

 Also: what do your disklabels look like?  My guess is you have a disk
 with 4K sectors, and your filesystems are not 4K-aligned.

 Later...

 Greg Oster

State-Changed-From-To: open->feedback
State-Changed-By: prlw1@NetBSD.org
State-Changed-When: Thu, 12 Sep 2019 14:43:39 +0000
State-Changed-Why:
Many questions were asked.


>Unformatted:

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