From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp017.mail.yahoo.com ([216.136.174.114]) by speech.braille.uwo.ca with smtp (Exim 3.34 #1 (Debian)) id 16pzCn-0001mr-00 for ; Tue, 26 Mar 2002 17:14:13 -0500 Received: from h0020780ec921.ne.client2.attbi.com (HELO mycomputer) (igueths@24.62.33.0 with login) by smtp.mail.vip.sc5.yahoo.com with SMTP; 26 Mar 2002 22:14:12 -0000 Message-ID: <003401c1d512$614abc60$01213e18@mycomputer> From: "Igor Gueths" To: References: <001601c1d464$3dfd19a0$01213e18@mycomputer> <20020326194657.C26311@joana.gotss.net> <005401c1d4fc$69a2ab40$01213e18@mycomputer> <20020327042332.B27181@joana.gotss.net> Subject: Re: mtu Date: Tue, 26 Mar 2002 17:05:45 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2615.200 Sender: speakup-admin@braille.uwo.ca Errors-To: speakup-admin@braille.uwo.ca X-BeenThere: speakup@braille.uwo.ca X-Mailman-Version: 2.0.8 Precedence: bulk Reply-To: speakup@braille.uwo.ca List-Help: List-Post: List-Subscribe: , List-Id: Speakup is a screen review system for Linux. List-Unsubscribe: , List-Archive: 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?=20 ----- Original Message -----=20 From: Kerry Hoath To: 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=20 > 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. >=20 > 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.=20 > > ----- Original Message -----=20 > > From: Kerry Hoath > > To: > > Sent: Tuesday, March 26, 2002 6:46 AM > > Subject: Re: mtu > >=20 > >=20 > > > 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=20 > > > and > > > ip nei help > > >=20 > > > 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!=20 > > > >=20 > > > >=20 > > > > _________________________________________________________ > > > > Do You Yahoo!? > > > > Get your free @yahoo.com address at http://mail.yahoo.com > > > >=20 > > > >=20 > > > > _______________________________________________ > > > > Speakup mailing list > > > > Speakup@braille.uwo.ca > > > > http://speech.braille.uwo.ca/mailman/listinfo/speakup > > > >=20 > > > >=20 > > >=20 > > > --=20 > > > Kerry Hoath: kerry@gotss.net kerry@gotss.eu.org or = kerry@gotss.spice.net.au > > > ICQ: 8226547 msn: kerry@gotss.net Yahoo: kerryhoath@yahoo.com.au > > >=20 > > > _______________________________________________ > > > Speakup mailing list > > > Speakup@braille.uwo.ca > > > http://speech.braille.uwo.ca/mailman/listinfo/speakup > >=20 > >=20 > > _________________________________________________________ > > Do You Yahoo!? > > Get your free @yahoo.com address at http://mail.yahoo.com > >=20 > >=20 > > _______________________________________________ > > Speakup mailing list > > Speakup@braille.uwo.ca > > http://speech.braille.uwo.ca/mailman/listinfo/speakup > >=20 >=20 > --=20 > Kerry Hoath: kerry@gotss.net kerry@gotss.eu.org or = kerry@gotss.spice.net.au > ICQ: 8226547 msn: kerry@gotss.net Yahoo: kerryhoath@yahoo.com.au >=20 > _______________________________________________ > Speakup mailing list > Speakup@braille.uwo.ca > http://speech.braille.uwo.ca/mailman/listinfo/speakup _________________________________________________________ Do You Yahoo!? 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