Eric,
This is what is confusing. I am looking in my RSP8 and I see 8MB MEMD:
sh contr cbus
MEMD at 40000000, 8388608 bytes (unused 13184, recarves 2, lost 0)
RawQ 48000100, ReturnQ 48000108, EventQ 48000110
BufhdrQ 48000148 (1147 items), LovltrQ 48000160 (36 items, 2016 bytes)
IpcbufQ 48000170 (40 items, 4096 bytes)
IpcbufQ_classic 48000168 (16 items, 4096 bytes)
3570 buffer headers (48002000 - 4800FF10)
pool0: 11 buffers, 256 bytes, queue 48000150
pool1: 942 buffers, 1536 bytes, queue 48000158
pool2: 1374 buffers, 4544 bytes, queue 48000178
pool3: 4 buffers, 4576 bytes, queue 48000180
But the docs say the the RSP8 ships w/64MB packet memory. The RSP4 has 2MB
SRAM (packet memory).
What happened to the other 56MB SRAM? I think this may be a misprint - 64
MB is the default DRAM option. I checked the RSP8 datasheet and it is
explicit in stating that there is 8MB SRAM. Maybe I'm crazy.
On the VIP4 thing, can you explain what changes are made to increase the
bandwidth? I recall hearing something about expanding the CyBUS to 64 bits
by using the 2 16bit channels and the the 32 bit channel used by the
VIP2-50. Is this correct? I also am aware of the PCI enhancements to
increase throughput to 800 Mbps (I assume 400/PA). There isn't much in the
docs on this, and if need be I can get it from the account team, but I
figured you may have something fast off the top of your head... ;-)
thanks,
chris
> 8MB of MEMD on RSP8, not 64MB. But it's still a lot more than 2MB.
>
> >
> > Does RSP8 add 'bandwidth' to the CyBUS or do we need
> VIP4-80s to get 4Gbps
> > (I seem to remember something about a CzBUS)? I want to
> see how far the
> > 7513 can go.
> >
>
> You need the VIP4s (50 or 80) to get more bandwidth.
>
> > Anyway, the important point to remember is that true
> distributed switching
> > on the RSP platforms only occurs between PA's in the same
> VIP (unlike the
> > GSR). InterVIP switching requires the RSP to manage access
> to MEMD between
> > VIPs (hence the high amount of RSB drops when the load is high).
> >
>
> Intra-vip switching isn't always purely local to the VIP. There are
> some timing and starvation issues where with some PAs, we still send
> traffic to MEMD. It's not often, and it only shows up in the
> high-speed PAs, and I'm not sure if VIP4s alleviate that at all, but
> that's how a few PAs on VIP2s behave.
>
>
>
> eric
>
This archive was generated by hypermail 2b29 : Sun Aug 04 2002 - 04:12:39 EDT