Date: Thu, 19 Apr 2001 16:18:13 +0300 From: Maxim Sobolev <sobomax@FreeBSD.org> To: Alfred Perlstein <bright@wintelcom.net> Cc: Doug Barton <DougB@DougBarton.net>, Matt Dillon <dillon@earth.backplane.com>, "'current@freebsd.org'" <current@FreeBSD.org> Subject: Re: FW: Filesystem gets a huge performance boost Message-ID: <3ADEE594.A49F8FD2@FreeBSD.org> References: <200104161634.f3GGYZs11356@aslan.scsiguy.com> <200104162146.f3GLkGT82369@earth.backplane.com> <3ADBF9FA.9D1C4DB4@DougBarton.net> <20010417011335.V976@fw.wintelcom.net> <3ADC0221.32127C39@DougBarton.net> <3ADEDE2F.573C20A1@FreeBSD.org> <20010419055523.G976@fw.wintelcom.net>
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Alfred Perlstein wrote:
> * Maxim Sobolev <sobomax@FreeBSD.org> [010419 05:48] wrote:
> > Doug Barton wrote:
> >
> > > Alfred Perlstein wrote:
> > >
> > > > I'm figuring the only time when it may be a problem is on machines
> > > > with a small amount of memory. Since memory is cheap, I plan on
> > > > turning it on within the next couple of days unless a stability
> > > > issue comes up.
> > > >
> > > > I'll leave it to those people with low memory to remember to turn
> > > > it off.
> > >
> > > OK... this brings up the question of what other cool optimizations are
> > > there that may have been disabled in the past for reasons that are no
> > > longer pertinent? It might be worthwhile to create an /etc/sysctl.conf file
> > > with commented out examples of configurations for various systems. For
> > > example,
> > >
> > > # For more modern systems that have a reasonable amount of RAM
> > > #vfs.vmiodirenable=1
> > >
> > > # Low memory systems
> > >
> > > # Systems that need lots of randomness
> > >
> > > # Low resource systems that need less randomness
> > >
> > > # Super high performance TCP options for various situations
> > >
> > > .... etc. I'm sure y'all can come up with more.
> > >
> > > It might also be desirable to put these in etc/defautls/rc.conf, but I
> > > think something of this nature might be better suited in a freer format.
> >
> > What do you think about attached patch?
>
> I think it's a step in the right direction, however
OOPS, I see. See updated patch.
-Maxim
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Index: Makefile
===================================================================
RCS file: /home/ncvs/src/etc/Makefile,v
retrieving revision 1.248
diff -d -u -r1.248 Makefile
--- Makefile 2001/03/29 14:02:59 1.248
+++ Makefile 2001/04/19 13:18:01
@@ -15,8 +15,8 @@
printcap profile protocols \
rc rc.atm rc.devfs rc.diskless1 rc.diskless2 rc.firewall rc.firewall6 \
rc.isdn rc.network rc.network6 rc.pccard rc.serial rc.shutdown \
- rc.syscons rc.sysctl remote rpc security services shells syslog.conf \
- usbd.conf \
+ rc.syscons rc.sysctl remote rpc security services shells sysctl.conf \
+ syslog.conf usbd.conf \
etc.${MACHINE_ARCH}/disktab \
etc.${MACHINE_ARCH}/rc.${MACHINE_ARCH} \
etc.${MACHINE_ARCH}/ttys \
Index: sysctl.conf
===================================================================
RCS file: /home/ncvs/src/etc/sysctl.conf,v
retrieving revision 1.1
diff -d -u -r1.1 sysctl.conf
--- sysctl.conf 2000/07/27 22:53:42 1.1
+++ sysctl.conf 2001/04/19 13:18:01
@@ -3,3 +3,10 @@
# This file is read when going to multi-user and its contents piped thru
# ``sysctl -w'' to adjust kernel values. ``man 5 sysctl.conf'' for details.
#
+
+vfs.vmiodirenable=0 # Set to 1 to enable the use of the VM subsystem to
+ # back UFS directory memory requirements. Because of
+ # the amount of wasted memory this causes it's not
+ # advised for machines with less than 64MB of RAM, but
+ # on machines with more than 64MB it can provide a
+ # substantial benefit related to directory caching
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