R
root
Do most 10/100/1000 PCI NICs only operate at 100Mbps when connected to a
33.3 MHz 32-bit PCI bus?
33.3 MHz 32-bit PCI bus?
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N
none
Depends on what it connects to and the cabling and patch cables and wall
plates and patch panel. Any one of these will cause it to drop back to 100.
plates and patch panel. Any one of these will cause it to drop back to 100.
R
root
100.none said:Depends on what it connects to and the cabling and patch cables and wall
plates and patch panel. Any one of these will cause it to drop back to
Of course. But why not try an answer the question that was asked?
N
none
Has nothing to with the bus speed. The bus may affect the utilization but
not the connection speed.
not the connection speed.
R
root
none said:Has nothing to with the bus speed. The bus may affect the utilization but
not the connection speed.
Well, unless there is a buffer size issue on the NIC in which case the
appropriate design would be to force 100 Mbps limit when on a 32-bit 33.3
MHz PCI bus. Therefore my question. Do you actually know anything about
such issues?
N
none
Why force it to a 100Mbps if the bus is 33MHz? Just because your bus and/or
harddisk and/or processor can not keep up with 1Gbps throughput why drop it
to 100Mbps? You may not get 1Gbps actual throughout but you might get 200 or
300 or 400 or 500 etc.. Mbps depending on the bus, disk and processor.
harddisk and/or processor can not keep up with 1Gbps throughput why drop it
to 100Mbps? You may not get 1Gbps actual throughout but you might get 200 or
300 or 400 or 500 etc.. Mbps depending on the bus, disk and processor.
R
root
none said:Why force it to a 100Mbps if the bus is 33MHz? Just because your bus and/or
harddisk and/or processor can not keep up with 1Gbps throughput why drop it
to 100Mbps? You may not get 1Gbps actual throughout but you might get 200 or
300 or 400 or 500 etc.. Mbps depending on the bus, disk and processor.
Apparently you have some kind of reading comprehension problem.
Could someone who understands the question posed and the concept of
buffering and the lack thereof please answer. I posed the question because
at least one poster in some thread somewhere claimed he couldn't get his
gigabit NIC to ever run at anything but 100 Mbps when plugged to a 32-bit
33.3 MHz PCI slot and it occurred to me that some implementations might do
just that.
N
none
The pci bus speed has nothing to do with the connection speed to the switch
or device. Period. The only thing the bus speed affects the throughtput
over said connection.
or device. Period. The only thing the bus speed affects the throughtput
over said connection.
R
root
none said:The pci bus speed has nothing to do with the connection speed to the switch
or device. Period. The only thing the bus speed affects the throughtput
over said connection.
Your reading comprehension problem is more profound than I originally
thought. Go off and study the concept of buffering. What if the card can
only buffer 512 bytes and it's expecting a 4096 byte chunk of data at 1e9
bits per sec? It can't dump it to a too slow PCI bus to a system RAM buffer
so it tells the sender to slow and use 1e8 bits per second. If the card
designer knows up front that such will be endemic to his PCI NIC design when
attached to a 32-bit 33.3 MHz PCI bus then he sets things such that 1e9 is
never set when on such a PCI bus. Is that simple enough to understand. Now
the question is whether such actually really is occurring in the real world.
Are there any gigabit NICs that behave in this fashion??
B
Bob Willard
root said:Your reading comprehension problem is more profound than I originally
thought. Go off and study the concept of buffering. What if the card can
only buffer 512 bytes and it's expecting a 4096 byte chunk of data at 1e9
bits per sec? It can't dump it to a too slow PCI bus to a system RAM buffer
so it tells the sender to slow and use 1e8 bits per second. If the card
designer knows up front that such will be endemic to his PCI NIC design when
attached to a 32-bit 33.3 MHz PCI bus then he sets things such that 1e9 is
never set when on such a PCI bus. Is that simple enough to understand. Now
the question is whether such actually really is occurring in the real world.
Are there any gigabit NICs that behave in this fashion??
Do you know of a GbE NIC that only has a 512B buffer? Or is your question
based on the assumption that some NIC designers are hopelessly stupid?
R
root
Bob Willard said:Do you know of a GbE NIC that only has a 512B buffer? Or is your question
based on the assumption that some NIC designers are hopelessly stupid?
Hopelessly greedy might be more accurate. If you'd read this thread then
you'd know that my question is based upon a thread I came across where
someone claimed that he was seeing exactly the described behavior. My
opening post in this thread was to determine if such behavior might be
common to very inexpensive first to market gigabit NICs that might be short
on buffering technology. Does anyone know anything about this issue?
N
none
Actually your ability to ask a question is what is profoundly in suspect.
Lets take a short look, and see if I can do this without being abusive like
yourself.
The closest you come to a question is your first post and even then you lack
the necessary information to properly determine what you are seeking. After
that you just become psychotic about it. oops I am bad
--------------- root asked
"Do most 10/100/1000 PCI NICs only operate at 100Mbps when connected to a
33.3 MHz 32-bit PCI bus?"
---------------
From this one could determine you are asking if most nics only operate at
100Mbps on a 32 - 33Mhz bus. What you do not define is if you are talking
about the link speed or the throughput. You said 100Mbps which in most cases
lends itself to the link speed. The answer for link speed would be "NO". As
far a the answer goes if we are talking about bus speed, the answer is again
"NO". It will pass as much as the system will allow, that might very well be
only 100Mbps but the network card does not magically look at the bus and say
"the poor machine can not possible keep up with Gigabit transfer rate so
lets restrict it to 100Mbps".
---------------
Well, unless there is a buffer size issue on the NIC in which case the
appropriate design would be to force 100 Mbps limit when on a 32-bit 33.3
MHz PCI bus. Therefore my question. Do you actually know anything about
such issues?
---------------
Your question is "you actually know anything about such issues?"
The answer is (again depending you if you mean link speed or throughput) I
have never had a gigabit nic linkup at only 100Mpbs because the PCI slot. I
have over 40 servers running teaming gigabit nics to Cisco switches. I do
have some older servers that did have a limited number of the 64bit slots. I
needed the 64bit slots for the 5304 smartarray controllers. While the nic
connected to the switch at 1Gbps the throughput was much less, it was
however more then 100Mbps. I do not think I will be buying a nic of your
design any time soon. "appropriate design would be to force 100 Mbps limit
when on a 32-bit 33.3 MHz PCI bus" sorry but that is just plain lunacy
After that your posts just start becoming incoherent. I can not tell if you
are complaining about the manufactures or if you are just upset because your
daddy took away your PS2.
KF'd
Lets take a short look, and see if I can do this without being abusive like
yourself.
The closest you come to a question is your first post and even then you lack
the necessary information to properly determine what you are seeking. After
that you just become psychotic about it. oops I am bad
--------------- root asked
"Do most 10/100/1000 PCI NICs only operate at 100Mbps when connected to a
33.3 MHz 32-bit PCI bus?"
---------------
From this one could determine you are asking if most nics only operate at
100Mbps on a 32 - 33Mhz bus. What you do not define is if you are talking
about the link speed or the throughput. You said 100Mbps which in most cases
lends itself to the link speed. The answer for link speed would be "NO". As
far a the answer goes if we are talking about bus speed, the answer is again
"NO". It will pass as much as the system will allow, that might very well be
only 100Mbps but the network card does not magically look at the bus and say
"the poor machine can not possible keep up with Gigabit transfer rate so
lets restrict it to 100Mbps".
---------------
Well, unless there is a buffer size issue on the NIC in which case the
appropriate design would be to force 100 Mbps limit when on a 32-bit 33.3
MHz PCI bus. Therefore my question. Do you actually know anything about
such issues?
---------------
Your question is "you actually know anything about such issues?"
The answer is (again depending you if you mean link speed or throughput) I
have never had a gigabit nic linkup at only 100Mpbs because the PCI slot. I
have over 40 servers running teaming gigabit nics to Cisco switches. I do
have some older servers that did have a limited number of the 64bit slots. I
needed the 64bit slots for the 5304 smartarray controllers. While the nic
connected to the switch at 1Gbps the throughput was much less, it was
however more then 100Mbps. I do not think I will be buying a nic of your
design any time soon. "appropriate design would be to force 100 Mbps limit
when on a 32-bit 33.3 MHz PCI bus" sorry but that is just plain lunacy
After that your posts just start becoming incoherent. I can not tell if you
are complaining about the manufactures or if you are just upset because your
daddy took away your PS2.
KF'd
A
Aaron
LOL
none said:Actually your ability to ask a question is what is profoundly in suspect.
Lets take a short look, and see if I can do this without being abusive like
yourself.
The closest you come to a question is your first post and even then you lack
the necessary information to properly determine what you are seeking. After
that you just become psychotic about it. oops I am bad
--------------- root asked
"Do most 10/100/1000 PCI NICs only operate at 100Mbps when connected to a
33.3 MHz 32-bit PCI bus?"
---------------
From this one could determine you are asking if most nics only operate at
100Mbps on a 32 - 33Mhz bus. What you do not define is if you are talking
about the link speed or the throughput. You said 100Mbps which in most cases
lends itself to the link speed. The answer for link speed would be "NO". As
far a the answer goes if we are talking about bus speed, the answer is again
"NO". It will pass as much as the system will allow, that might very well be
only 100Mbps but the network card does not magically look at the bus and say
"the poor machine can not possible keep up with Gigabit transfer rate so
lets restrict it to 100Mbps".
---------------
Well, unless there is a buffer size issue on the NIC in which case the
appropriate design would be to force 100 Mbps limit when on a 32-bit 33.3
MHz PCI bus. Therefore my question. Do you actually know anything about
such issues?
---------------
Your question is "you actually know anything about such issues?"
The answer is (again depending you if you mean link speed or throughput) I
have never had a gigabit nic linkup at only 100Mpbs because the PCI slot. I
have over 40 servers running teaming gigabit nics to Cisco switches. I do
have some older servers that did have a limited number of the 64bit slots. I
needed the 64bit slots for the 5304 smartarray controllers. While the nic
connected to the switch at 1Gbps the throughput was much less, it was
however more then 100Mbps. I do not think I will be buying a nic of your
design any time soon. "appropriate design would be to force 100 Mbps limit
when on a 32-bit 33.3 MHz PCI bus" sorry but that is just plain lunacy
After that your posts just start becoming incoherent. I can not tell if you
are complaining about the manufactures or if you are just upset because your
daddy took away your PS2.
KF'd
R
root
Ah so you are a tech with no real technical background.
D
DS
<SNIP>
Since everyone that has answered you so far has said the bus spped
shouldn't affect the LINK speed, which you didn't believe, I'll say YES!!
that's the problem....now go fix it.
I guess that's why my C64 didn't work at 9600 baud.
Since everyone that has answered you so far has said the bus spped
shouldn't affect the LINK speed, which you didn't believe, I'll say YES!!
that's the problem....now go fix it.
I guess that's why my C64 didn't work at 9600 baud.
W
wojo
wow your a youngin' I paid $65 for my 2400baud for C64
lol
lol
D
DS
I got one as a gift in the early eighties and only had the tape drive, I
was poor. I did though by a whole bunch of C64 stuff in 1991 for $125,
including 2 C64's, a single and a dual disk-drive, a 4800 baud modem and
some other stuff.
This whole thread kills me.....some people......
http://groups.google.com/groups?q=pci+33mhz+gigabit&hl=en&lr=&ie=UTF-8
&oe=UTF-8&start=20&sa=N
This google groups search results has all kinds of discussions about
gigabit e-net, including a gazillion (ok, maybe not THAT many) posts
about 32bit/33mhz and 64bit/66mhz comparisons (none of which say they
don't work by the way). Easier than asking a question here, then waiting
for replies only to not hear the answer you wanted to here, repetitively.
was poor. I did though by a whole bunch of C64 stuff in 1991 for $125,
including 2 C64's, a single and a dual disk-drive, a 4800 baud modem and
some other stuff.
This whole thread kills me.....some people......
http://groups.google.com/groups?q=pci+33mhz+gigabit&hl=en&lr=&ie=UTF-8
&oe=UTF-8&start=20&sa=N
This google groups search results has all kinds of discussions about
gigabit e-net, including a gazillion (ok, maybe not THAT many) posts
about 32bit/33mhz and 64bit/66mhz comparisons (none of which say they
don't work by the way). Easier than asking a question here, then waiting
for replies only to not hear the answer you wanted to here, repetitively.
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