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From Marc Slemko <ma...@znep.com>
Subject Re: Serious performance issue with 2.2.5-RELEASE (fwd)
Date Sun, 23 Nov 1997 18:42:01 GMT


---------- Forwarded message ----------
Date: Sun, 23 Nov 1997 11:19:31 +0300 (????)
From: Dmitry Khrustalev <dima@bog.msu.su>
To: Jaye Mathisen <mrcpu@cdsnet.net>
Cc: David Greenman <dg@root.com>, hackers@freebsd.org
Subject: Re: Serious performance issue with 2.2.5-RELEASE 



On Sat, 22 Nov 1997, Jaye Mathisen wrote:

> 
> I do not believe so.  What ever it is definitely appears related to
> swapping/paging somehow.

I beleive the following patch to apache should improve situation:

--- alloc.c.old	Sun Nov 23 11:15:31 1997
+++ alloc.c	Sun Nov 23 11:16:34 1997
@@ -199,7 +199,8 @@
   /* Nope. */
 
   min_size += BLOCK_MINFREE;
-  return malloc_block((min_size > BLOCK_MINALLOC) ? min_size : BLOCK_MINALLOC);
+  return malloc_block((min_size > BLOCK_MINALLOC - sizeof(union block_hdr)) ?
+     min_size : BLOCK_MINALLOC - sizeof(union block_hdr));
 }
 



> 
> I get these LA spikes in the several hundreds, the disk light is on solid
> for 2-3 minutes, then it all goes away.
> 
> System accounting doesn't show any unusual pattern of apps being run.  The
> vast majority are perl scripts.
> 
> There's about 1100 processes on the machine, give or take a few, with
> about 80MB RAM free.
> 
> NFS is compiled in, but not used.
> 
> I have also disabled ntpd thinking something was hanging there, but 
> no dice.
> 
> 
> 
> On Sat, 22 Nov 1997, David Greenman wrote:
> 
> > >I upgraded my web server to 2.2.5 from 2.2.2-stable, dated sometime in
> > >July.  
> > >
> > >Big mistake.
> > >
> > >The only update to take place was the make buildworld, make installworld,
> > >no other configuration files were modified, nor any changes to startup
> > >scripts, etc.
> > >
> > >I now get these weird pauses where everything on the machine just freezes
> > >for 30-40 seconds, sometimes longer.  NFS is compiled in, but not in use.
> > >
> > >The system was a web server, and was happily serving up several hundred
> > >domains.  Now with the upgrade, I'll be lucky to keep them..  Not good.
> > >
> > >It's a Super Micro P6, 384MB RAM, 2 SCSI disks off a bus-logic controller.
> > >
> > >Any ideas appreciated.  I have built a new kernel from sources supped
> > >11/7, but it doesn't seem to be any better.
> > 
> >    Is it possible that the slowness could actually be a network related
> > problem involving the updated 'de' driver in 2.2.5?
> > 
> > -DG
> > 
> > David Greenman
> > Core-team/Principal Architect, The FreeBSD Project
> > 
> 


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