Messages in this thread | | | Date | Wed, 24 Aug 2005 21:51:57 -0700 | From | Ben Greear <> | Subject | Re: 2.6.12 Performance problems |
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Danial Thom wrote:
> I think the concensus is that 2.6 has made trade > offs that lower raw throughput, which is what a > networking device needs. So as a router or > network appliance, 2.6 seems less suitable. A raw > bridging test on a 2.0Ghz operton system: > > FreeBSD 4.9: Drops no packets at 900K pps > Linux 2.4.24: Starts dropping packets at 350K pps > Linux 2.6.12: Starts dropping packets at 100K pps
I ran some quick tests using kernel 2.6.11, 1ms tick (HZ=1000), SMP kernel. Hardware is P-IV 3.0Ghz + HT on a new SuperMicro motherboard with 64/133Mhz PCI-X bus. NIC is dual Intel pro/1000. Kernel is close to stock 2.6.11.
I used brctl to create a bridge with the two GigE adapters in it and used pktgen to stream traffic through it (250kpps in one direction, 1kpps in the other.)
I see a reasonable amount of drops at 250kpps (60 byte packets): about 60,000,000 packets received, 20,700 dropped.
Interestingly, the system is about 60% idle according to top, and still dropping pkts, so it would seem that the system could be better utilized!
Ben
-- Ben Greear <greearb@candelatech.com> Candela Technologies Inc http://www.candelatech.com
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