| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1515.1 | I think this is what you're after.... | NETCAD::BATTERSBY | | Tue Oct 04 1994 10:27 | 5 |
| I think there are 128 entries for both transmit and receive queues
for ports 2-7, and 256 entries each for transmit, receive, and mgmt
queues for port 1.
Bob
|
| 1515.2 | buffer size (bytes) | TKOV51::SATO_TET | Cogito Ergo Sum | Wed Jun 07 1995 02:54 | 8 |
| How many buffer size (bytes) do DECswich 900EF and PEswitch 900TX have ?
There are 128 enries for each port 2-7 and 256 entries for port 1 ?
That is ,the buffer size is 128*1.5k bytes,right ? and 256*4.5k byte,right ?
tetsuya
|
| 1515.3 | RE: Buffer size queues.... | NETCAD::BATTERSBY | | Wed Jun 07 1995 10:12 | 7 |
| Yes, you can think of it in terms of max frame size for both Ethernet
and FDDI. Keep in mind that there are 128 entries for both transmit
*and* receive for each of the 6 Ethernet ports. Also with FDDI, there
are 256 entries for both transmit and receive, and 256 more entries for
management queues on FDDI.
Bob
|
| 1515.4 | | NETCAD::ANIL | | Wed Jun 21 1995 13:13 | 16 |
| 256 buffers of 2 KBytes for each Ethernet port, divided equally between
receive and transmit. 512 2 KByte buffers for the FDDI port, divided
equally between receive and transmit plus an additional 1 MB of
buffering space which is "flexible" buffer size (ie, buffers are
allocated as per the needs of the incoming packet). Since Ethernet
max size is 1518 bytes, each buffer is capable of holding a full-size
packet. Since FDDI packets can be up to 4500 bytes long, they are
chained in successive buffers if necessary. Another good way of
looking at it is that we have 0.5 MB of buffer space dedicated to
each Ethernet port and 2 MB dedicated to the FDDI.
Not that any of this really means much to the typical customer.. what
they need to know is our performance in congested situations. The
Lippis report may be of help, we performed very well.
Anil
|