On 01/09/2012 11:23 PM, Morgan McLean wrote:
Its an SRX3600 cluster, with no traffic traversing the fabric connection, so its all being contained on one chassis. These are just standard ICMP packets between two linux hosts on different subnets.
I assume you are using these as a firewall, not just as a "convenient" JunOS router?
What is the security topology? How many policies and of what type do you have? What's the background load in terms of bits/sec, packets/sec, session ramp rate, etc.? What are the interface speeds?
This is a complex question to answer in general. To give some comparative data, we have Netscreen 5400s with M2 10G cards, hundreds of policies, tens of thousands of address book entries, full BGP routing with ~1000 routing entries, and session counts of ~20k sessions, ramp rate ~15k/minute.
Through these firewalls, we incur an extra ~200usec on a ping round trip time.
So yes, I would say that going from 0.1msec (100usec) to 0.5msec (500usec) is about the right order for a fast gig/ten gig firewall with moderately complex config and load. Obviously the SRX 3600 and NS 5400 are different beasts.
Frankly, if your demands are such that you can't tolerate 400usec of incurred latency, you possibly shouldn't be running it though a security device. What kind of "caching application" is this?
Are you sure the latency you're measuring with a ping is the same latency your application is incurring? Are you sure an ALG isn't activating for your traffic - perhaps try creating a policy to match the traffic and explicitly disable the "application" / ALG.
Cheers, Phil _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
