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@xxxxxxxxx> 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
