Re: OT crossover cable speed
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Switches don't really have collisions per-say - in an ethenet sense. Most consumer small swithes experience what's called head-of-line blocking, however. This is the case when a frame is queued to go out a particular port which is busy, behind this frame (in the queue) is another packet waiting to go out another port which happens to be free this cycle. It wont be processed, unfortunatly, until the packet ahead of it can go out. Larger switches Cisco 6500, Foundry, Extreme, ...etc don't have this problem by having seperate queues for evey port. On Wed, 27 Mar 2002, Nathan E Norman wrote: > On Tue, Mar 26, 2002 at 11:09:00PM -0500, Jason Healy wrote: > > At 1017245979s since epoch (03/26/02 22:19:39 -0500 UTC), Crispin > > Wellington wrote: > > > Of course theres collisions. But switch <-> Computer has collisions > > > too. > > > > Unless you're running in full duplex (both crossover and switches > > support this mode, so long as the NIC/switch at each end both support > > it and are configured correctly). Then there's no collisions, and > > you have a nice fast connection. > > Well, full duplex prevents collisions from host <-> switch. But > switches do have collisions internally when two ports want to talk to > a third port at the same time. It's difficult to know whether this is > happening unless you have a managed switch. > > -- > Nathan Norman - Micromuse Ltd. mailto:[EMAIL PROTECTED] > Gil-galad was an Elven-king.| The Fellowship > Of him the harpers sadly sing: |of > the last whose realm was fair and free | the Ring > between the Mountains and the Sea. | J.R.R. Tolkien > -BEGIN PGP SIGNATURE- Version: GnuPG v1.0.6 (GNU/Linux) Comment: Made with pgp4pine 1.76 iD8DBQE8ogpAWMfBXOjbFQcRAsVKAJ0UsMl1g11Bl4EZJnxMZCgV8wO2hQCcCtdR HIJASlZjvjn16eryUNea1W0= =XN+9 -END PGP SIGNATURE- -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: OT crossover cable speed
On Tue, Mar 26, 2002 at 11:09:00PM -0500, Jason Healy wrote: > At 1017245979s since epoch (03/26/02 22:19:39 -0500 UTC), Crispin Wellington > wrote: > > Of course theres collisions. But switch <-> Computer has collisions > > too. > > Unless you're running in full duplex (both crossover and switches > support this mode, so long as the NIC/switch at each end both support > it and are configured correctly). Then there's no collisions, and > you have a nice fast connection. Well, full duplex prevents collisions from host <-> switch. But switches do have collisions internally when two ports want to talk to a third port at the same time. It's difficult to know whether this is happening unless you have a managed switch. -- Nathan Norman - Micromuse Ltd. mailto:[EMAIL PROTECTED] Gil-galad was an Elven-king.| The Fellowship Of him the harpers sadly sing: |of the last whose realm was fair and free | the Ring between the Mountains and the Sea. | J.R.R. Tolkien pgpkbtwJmrEKA.pgp Description: PGP signature
Re: OT crossover cable speed
Ühel ilusal päeval [26.03.2002] kirjutas dman <[EMAIL PROTECTED]>: > On Mon, Mar 25, 2002 at 06:50:06AM -0500, Jason M. Harvey wrote: > | On Mon, Mar 25, 2002 at 01:16:01AM -0800, Sean 'Shaleh' Perry wrote: > | | > | | On 25-Mar-2002 Rob VanFleet wrote: > | | > Sorry this has nothing to do with Debian, but I'm at a loss as to where > | | > else to ask (if it matters, both machines are running Debian ). > | | > > | | > I am looking to connect two machines, one will be connected to the > | | > outside network, the other connected to it via a second NIC. I really > | | > don't want to use a switch for just two machines, but I am wondering if > | | > a crossover cable has any speed disadvantages as opposed to a small > | | > switch. These machines will constantly be transferring data, so I would > | | > like the connection to be as fast as possible (limited by the NICs to > | | > 100 Mbs). > | | > | | should go as fast as the wire allows. > | > | i agree. a crossover cable is just the same as a straight cable, with > | just 4 wires going to different pins but the resistance is still the > | same. > > Right. > > | just a guess here, but thinking of resistance in the wire, crossover > | may have less resistance than a switch (if it matters). > > I don't think it matters since the switch has its own power source. > If the machines are separated by a long distance, having one or more > switches would improve performance because a clean signal will always > be emitted from the "far" side even if the incoming signal is a little > dirty. > > If the machines are close together, then the only practical difference > you'll notice is the cost (time and money) of locating and installing > the hardware. Hmm, the switch would use some more power too (for your > utility bill). Hei! And don't forget, that although switches are very fast, they consume a little amount of time, when they are reading the ethernet frame and analyzing it. Switch has to make a lot of decicions, before it can repeat the ethernet frame on one of its ports. Namarie! Juhan -- In the early morning hour, when the pub was closing, my grandpa emptied his tankard, stood up and said his famous words: When you say that your troubles are as great as my own, that may be true. But consider the fact that mine happen to me while yours merely happen to you. http://juku.kicks-ass.net/ -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: OT crossover cable speed
At 1017245979s since epoch (03/26/02 22:19:39 -0500 UTC), Crispin Wellington wrote: > Of course theres collisions. But switch <-> Computer has collisions > too. Unless you're running in full duplex (both crossover and switches support this mode, so long as the NIC/switch at each end both support it and are configured correctly). Then there's no collisions, and you have a nice fast connection. Your point about the factor affecting both crossover and switches is quite correct regardless, however. You can really just think of a switch as an N-way crossover cable connection; each port on the switch only gets traffic bound for the machine on that port. Jason -- Jason Healy|[EMAIL PROTECTED]| http://www.logn.net/ -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: OT crossover cable speed
On Mon, 2002-03-25 at 17:56, Rob VanFleet wrote: > Sorry this has nothing to do with Debian, but I'm at a loss as to where > else to ask (if it matters, both machines are running Debian ). > > I am looking to connect two machines, one will be connected to the > outside network, the other connected to it via a second NIC. I really > don't want to use a switch for just two machines, but I am wondering if > a crossover cable has any speed disadvantages as opposed to a small > switch. These machines will constantly be transferring data, so I would > like the connection to be as fast as possible (limited by the NICs to > 100 Mbs). The switch will probably be *slower* that the crossover. Depends on which layer the switch operates and its modes of forwarding (cut through, store and forward, etc). Basically a switch has to do work on the packets to shuffle them around. A cross over cable doesn't. Its just the two computers going hammer and tongs. Of course theres collisions. But switch <-> Computer has collisions too. Anyway. You'll find a switch slower (Its really trivial. Because they are both really fast). Kind Regards Crispin Wellington -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: OT crossover cable speed
On Tue, Mar 26, 2002 at 11:29:10AM -0600, dman wrote: | On Mon, Mar 25, 2002 at 06:50:06AM -0500, Jason M. Harvey wrote: | | On Mon, Mar 25, 2002 at 01:16:01AM -0800, Sean 'Shaleh' Perry wrote: | | | | | | On 25-Mar-2002 Rob VanFleet wrote: | | | > Sorry this has nothing to do with Debian, but I'm at a loss as to where | | | > else to ask (if it matters, both machines are running Debian ). | | | > | | | > I am looking to connect two machines, one will be connected to the | | | > outside network, the other connected to it via a second NIC. I really | | | > don't want to use a switch for just two machines, but I am wondering if | | | > a crossover cable has any speed disadvantages as opposed to a small | | | > switch. These machines will constantly be transferring data, so I would | | | > like the connection to be as fast as possible (limited by the NICs to | | | > 100 Mbs). | | | | | | should go as fast as the wire allows. | | | | i agree. a crossover cable is just the same as a straight cable, with | | just 4 wires going to different pins but the resistance is still the | | same. | | Right. | | | just a guess here, but thinking of resistance in the wire, crossover | | may have less resistance than a switch (if it matters). | | I don't think it matters since the switch has its own power source. | If the machines are separated by a long distance, having one or more | switches would improve performance because a clean signal will always | be emitted from the "far" side even if the incoming signal is a little | dirty. | | If the machines are close together, then the only practical difference | you'll notice is the cost (time and money) of locating and installing | the hardware. Hmm, the switch would use some more power too (for your | utility bill). | | -D | | -- | | Thy Word is a lamp unto my feet | and a light unto my path. | Psalms 119:105 | | nice. very good points. ~jason -- --- | http://theigloo.dhs.org:81 | http://counter.li.org/| | Debian GNU/Linux 3.0 Woody | 2.4.16-k6 | | [EMAIL PROTECTED] | registered linux user #202942 | --- pgpUFin74MfMq.pgp Description: PGP signature
Re: OT crossover cable speed
On Mon, Mar 25, 2002 at 06:50:06AM -0500, Jason M. Harvey wrote: | On Mon, Mar 25, 2002 at 01:16:01AM -0800, Sean 'Shaleh' Perry wrote: | | | | On 25-Mar-2002 Rob VanFleet wrote: | | > Sorry this has nothing to do with Debian, but I'm at a loss as to where | | > else to ask (if it matters, both machines are running Debian ). | | > | | > I am looking to connect two machines, one will be connected to the | | > outside network, the other connected to it via a second NIC. I really | | > don't want to use a switch for just two machines, but I am wondering if | | > a crossover cable has any speed disadvantages as opposed to a small | | > switch. These machines will constantly be transferring data, so I would | | > like the connection to be as fast as possible (limited by the NICs to | | > 100 Mbs). | | | | should go as fast as the wire allows. | | i agree. a crossover cable is just the same as a straight cable, with | just 4 wires going to different pins but the resistance is still the | same. Right. | just a guess here, but thinking of resistance in the wire, crossover | may have less resistance than a switch (if it matters). I don't think it matters since the switch has its own power source. If the machines are separated by a long distance, having one or more switches would improve performance because a clean signal will always be emitted from the "far" side even if the incoming signal is a little dirty. If the machines are close together, then the only practical difference you'll notice is the cost (time and money) of locating and installing the hardware. Hmm, the switch would use some more power too (for your utility bill). -D -- Thy Word is a lamp unto my feet and a light unto my path. Psalms 119:105 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: OT crossover cable speed
On Mon, Mar 25, 2002 at 10:16:42AM -0500, [EMAIL PROTECTED] wrote: > On Mon, Mar 25, 2002 at 10:55:05PM +1100, CaT wrote: > > On Mon, Mar 25, 2002 at 03:56:51AM -0600, Rob VanFleet wrote: > > > don't want to use a switch for just two machines, but I am wondering if > > > a crossover cable has any speed disadvantages as opposed to a small > > > switch. These machines will constantly be transferring data, so I would > > > > A switch will give you full duplex capability. With crossover you only > > get half-duplex. > > Completely untrue. Yes. As I've found out later. Pardon my brainfart. :) -- SOCCER PLAYER IN GENITAL-BITING SCANDAL --- "It was something between friends that I thought would have no importance until this morning when I got up and saw all the commotion in the news," Gallardo told a news conference. "It stunned me." Reyes told Marca that he had "felt a slight pinch." -- http://www.azcentral.com/offbeat/articles/1129soccer29-ON.html -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: OT crossover cable speed
On Mon, Mar 25, 2002 at 10:55:05PM +1100, CaT wrote: > On Mon, Mar 25, 2002 at 03:56:51AM -0600, Rob VanFleet wrote: > > don't want to use a switch for just two machines, but I am wondering if > > a crossover cable has any speed disadvantages as opposed to a small > > switch. These machines will constantly be transferring data, so I would > > A switch will give you full duplex capability. With crossover you only > get half-duplex. Completely untrue. -dsr- -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: OT crossover cable speed
On Mon, Mar 25, 2002 at 03:56:51AM -0600, Rob VanFleet wrote: > don't want to use a switch for just two machines, but I am wondering if > a crossover cable has any speed disadvantages as opposed to a small > switch. These machines will constantly be transferring data, so I would A switch will give you full duplex capability. With crossover you only get half-duplex. -- SOCCER PLAYER IN GENITAL-BITING SCANDAL --- "It was something between friends that I thought would have no importance until this morning when I got up and saw all the commotion in the news," Gallardo told a news conference. "It stunned me." Reyes told Marca that he had "felt a slight pinch." -- http://www.azcentral.com/offbeat/articles/1129soccer29-ON.html -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: OT crossover cable speed
On Mon, Mar 25, 2002 at 01:16:01AM -0800, Sean 'Shaleh' Perry wrote: | | On 25-Mar-2002 Rob VanFleet wrote: | > Sorry this has nothing to do with Debian, but I'm at a loss as to where | > else to ask (if it matters, both machines are running Debian ). | > | > I am looking to connect two machines, one will be connected to the | > outside network, the other connected to it via a second NIC. I really | > don't want to use a switch for just two machines, but I am wondering if | > a crossover cable has any speed disadvantages as opposed to a small | > switch. These machines will constantly be transferring data, so I would | > like the connection to be as fast as possible (limited by the NICs to | > 100 Mbs). | > | | should go as fast as the wire allows. | | i agree. a crossover cable is just the same as a straight cable, with just 4 wires going to different pins but the resistance is still the same. just a guess here, but thinking of resistance in the wire, crossover may have less resistance than a switch (if it matters). ~jason -- --- | http://theigloo.dhs.org:81 | http://counter.li.org/| | Debian GNU/Linux 3.0 Woody | 2.4.16-k6 | | [EMAIL PROTECTED] | registered linux user #202942 | --- pgpeogFkgGFHV.pgp Description: PGP signature
Re: OT crossover cable speed
On 25-Mar-2002 Rob VanFleet wrote: > Sorry this has nothing to do with Debian, but I'm at a loss as to where > else to ask (if it matters, both machines are running Debian ). > > I am looking to connect two machines, one will be connected to the > outside network, the other connected to it via a second NIC. I really > don't want to use a switch for just two machines, but I am wondering if > a crossover cable has any speed disadvantages as opposed to a small > switch. These machines will constantly be transferring data, so I would > like the connection to be as fast as possible (limited by the NICs to > 100 Mbs). > should go as fast as the wire allows. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
OT crossover cable speed
Sorry this has nothing to do with Debian, but I'm at a loss as to where else to ask (if it matters, both machines are running Debian ). I am looking to connect two machines, one will be connected to the outside network, the other connected to it via a second NIC. I really don't want to use a switch for just two machines, but I am wondering if a crossover cable has any speed disadvantages as opposed to a small switch. These machines will constantly be transferring data, so I would like the connection to be as fast as possible (limited by the NICs to 100 Mbs). Thanks for any advice, Rob -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
