Re: kern/48178: Extremely slow disk read/write

[Greg Oster <oster%cs.usask.ca@localhost>]

The following reply was made to PR kern/48178; it has been noted by GNATS.

From: Greg Oster <oster%cs.usask.ca@localhost>
To: gnats-bugs%NetBSD.org@localhost
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@localhost> wrote:
 
 > The following reply was made to PR kern/48178; it has been noted by
 > GNATS.
 > 
 > From: David Holland <dholland-bugs%netbsd.org@localhost>
 > To: gnats-bugs%NetBSD.org@localhost
 > 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@localhost
 > 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