Re:Hello IPv6: a minimal tutorial for IPv4 users
by Dagger2 on Saturday October 09, 2021 @12:14AM
(#28807002)
But if you're doing fast hardware routing, that's tens and tens of megabytes of TCAM, not DRAM. It's more akin to CPU cache in terms of latency, capacity and cost.
[ Parent
| on HN ]
Re:Hello IPv6: a minimal tutorial for IPv4 users
by Dylan16807 on Saturday October 09, 2021 @12:45AM
(#28807131)
You can get a $600 Epyc with 128MB of cache. That shouldn't be too much compared to the tier of router we're talking about, right?
Re:Hello IPv6: a minimal tutorial for IPv4 users
by Dagger2 on Saturday October 09, 2021 @02:01AM
(#28807418)
That's L3 cache though; they only have 0.5 MB of L2 cache per core.
I'm not really sure how much each of these types of memory cost, but I did find [1] which says "The cost of TCAM is also about 30 times more per bit of storage than SRAM". That suggests a CPU with something more like 0.5-1 GB of L3 cache would be a closer comparison.
[1] https://research.ijcaonline.org/volume115/number7/pxc3902299...