mtu

[Kerry Hoath]

lnp100tx, what driver do you load for this card?
I need to know so I know what sort of chip is on the card.
Is it the tulip driver?

Regards, Kerry.
On Tue, Mar 26, 2002 at 05:05:45PM -0500, Igor Gueths wrote:
> Hi Kerry. I actually have an lne100TX, and I think it does pretty good for speed. What other options could I tweak for speed improvements could I manipulate? 
> ----- Original Message ----- 
> From: Kerry Hoath <kerry at gotss.net>
> To: <speakup at braille.uwo.ca>
> Sent: Tuesday, March 26, 2002 3:23 PM
> Subject: Re: mtu
> 
> 
> > The ethernet frame size is 1524 bytes. You can't
> > raise the mtu higher than that you just end up with a pile of back to back
> > full-sized ethernet frames and loose performance due to the
> > fragmentation.
> > What transferrs are you trying to speed up and what sort of card is this? There may
> > be other options you can tweak that don't involve fooling with the 
> > framesize on ethernet.
> > Increasing mtu can also cause problems with cards that are not capable of
> > receiving giant frames. You're also violating
> > the ethernet standards if you exceed the maximum framesize.
> > I doubt you will gain any performance by reducing wire overhead, your
> > need for speed can be solved in other ways. How fast is this machine and is the
> > card isa/pci?
> > If it isn't a pci busmaster and is an rtl8029, it's a cheap
> > card and is a connectivity solution. Snap it in half and go buy a real card
> > if speed and system performance is important to you or tolerate
> > the slower speeds to save money.
> > 3com 905 cards cost a lot of money for a good reason, they are fast
> > efficient and easy on cpu.
> > The rtl8029 and rtl8139 are mass market pci ethernet chips that aren't known
> > for speed. Linux usually drives them as best it can but
> > there are all sorts of hardware limitations to work around and
> > bugs that bite.
> > 
> > Regards, Kerry.
> > On Tue, Mar 26, 2002 at 02:28:26PM -0500, Igor Gueths wrote:
> > > Hi Kerry. Wouldn't increasing the mtu value decrease over head? Because I am trying to raise the value to 10000 or something, not lower it. 
> > > ----- Original Message ----- 
> > > From: Kerry Hoath <kerry at gotss.net>
> > > To: <speakup at braille.uwo.ca>
> > > Sent: Tuesday, March 26, 2002 6:46 AM
> > > Subject: Re: mtu
> > > 
> > > 
> > > > I can't see why you'd want to do this on an ethernet
> > > > interface anyway since ethernet is tuned to handle mtu of 1500 and reducing it
> > > > is just going to increase wire overhead and do nothing more.
> > > > MTU discovery means that if something else has a lower mtu this will be communicated back
> > > > to the kernel and th e networking stack will take care of it.
> > > > Well just because I don't know why you want to do this doesn't mean it can't be done.
> > > > Once the route to the interface is in place you need to del the route and re-add it
> > > > with the mtu value so for example:
> > > > route del 192.168.1.0
> > > > route add -net 192.168.1.0 dev eth0 mtu 768
> > > > and I think the ip tools can do this too
> > > > try ip route help 
> > > > and
> > > > ip nei help
> > > > 
> > > > Regards, Kerry.
> > > > On Mon, Mar 25, 2002 at 08:19:13PM -0500, Igor Gueths wrote:
> > > > > Hi. Has anyone successfully changed their mtu value on their network interface? I am unable to do this via /etc/network/interfaces. I put mtu 1000 after the line where it says iface eth0 inet dhcp. I restarted inetd and init, and the value hasn't changed. Does anyone know how to go about doing this? Thanks! 
> > > > > 
> > > > > 
> > > > > _________________________________________________________
> > > > > Do You Yahoo!?
> > > > > Get your free @yahoo.com address at http://mail.yahoo.com
> > > > > 
> > > > > 
> > > > > _______________________________________________
> > > > > Speakup mailing list
> > > > > Speakup at braille.uwo.ca
> > > > > http://speech.braille.uwo.ca/mailman/listinfo/speakup
> > > > > 
> > > > > 
> > > > 
> > > > -- 
> > > > Kerry Hoath:  kerry at gotss.net kerry at gotss.eu.org or  kerry at gotss.spice.net.au
> > > > ICQ: 8226547 msn: kerry at gotss.net Yahoo: kerryhoath at yahoo.com.au
> > > > 
> > > > _______________________________________________
> > > > Speakup mailing list
> > > > Speakup at braille.uwo.ca
> > > > http://speech.braille.uwo.ca/mailman/listinfo/speakup
> > > 
> > > 
> > > _________________________________________________________
> > > Do You Yahoo!?
> > > Get your free @yahoo.com address at http://mail.yahoo.com
> > > 
> > > 
> > > _______________________________________________
> > > Speakup mailing list
> > > Speakup at braille.uwo.ca
> > > http://speech.braille.uwo.ca/mailman/listinfo/speakup
> > > 
> > 
> > -- 
> > Kerry Hoath:  kerry at gotss.net kerry at gotss.eu.org or  kerry at gotss.spice.net.au
> > ICQ: 8226547 msn: kerry at gotss.net Yahoo: kerryhoath at yahoo.com.au
> > 
> > _______________________________________________
> > Speakup mailing list
> > Speakup at braille.uwo.ca
> > http://speech.braille.uwo.ca/mailman/listinfo/speakup
> 
> 
> _________________________________________________________
> Do You Yahoo!?
> Get your free @yahoo.com address at http://mail.yahoo.com
> 
> 
> _______________________________________________
> Speakup mailing list
> Speakup at braille.uwo.ca
> http://speech.braille.uwo.ca/mailman/listinfo/speakup
> 

-- 
Kerry Hoath:  kerry at gotss.net kerry at gotss.eu.org or  kerry at gotss.spice.net.au
ICQ: 8226547 msn: kerry at gotss.net Yahoo: kerryhoath at yahoo.com.au