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after upgrading one of our routers last month, to AMD Athlon(tm) 64 X2
Dual Core Processor 4400+, we started to experience some weird problems
with e1000 driver. Our previous CPU was Athlon 64 (not SMP). We're using
Debian GNU/Linux stable 4.0 (etch), and vanilla kernel 2.6.21.1. The
motherboard is Albatron K8NF4-AM2. Their site really sucks, and there is no
BIOS updates at all. The router had 3 Intel Gigabith cards (82541PI
chipsets according lspci)

This router is increasing latency one-two times for few minutes to very
high levels (sometimes to 3-4 seconds!). When the latency is up so high
every few minutes and there is also packet loss in this time. This is
happening for month or two maybe, and I tried so many kernels, from 2.6.19
to 2.6.21.1 and none of them are working OK. In the beginning there was
also hardware reset of the adapters, but after some kernel version update
this disappeared.
I tried also every single driver from your project until now (including
e1000-7.5.5), none of them resolved my problem. If I had to be accurate
(from 2-3 releases of e1000 driver until now my problem with TX Hang (or RX
Hang) disappear. But the latency and packet loss problem remains. You can
see my ping to the router:

....
Reply from X.X.X.X: bytes=32 time<1ms TTL=63
Reply from X.X.X.X: bytes=32 time<1ms TTL=63
Reply from X.X.X.X: bytes=32 time<1ms TTL=63
Reply from X.X.X.X: bytes=32 time=97ms TTL=63
Reply from X.X.X.X: bytes=32 time=124ms TTL=63
Reply from X.X.X.X: bytes=32 time=203ms TTL=63
Reply from X.X.X.X: bytes=32 time=276ms TTL=63
Reply from X.X.X.X: bytes=32 time=1062ms TTL=63
Reply from X.X.X.X: bytes=32 time=918ms TTL=63
Reply from X.X.X.X: bytes=32 time=183ms TTL=63
Reply from X.X.X.X: bytes=32 time=242ms TTL=63
Reply from X.X.X.X: bytes=32 time=209ms TTL=63
Reply from X.X.X.X: bytes=32 time=933ms TTL=63
Reply from X.X.X.X: bytes=32 time=514ms TTL=63
Reply from X.X.X.X: bytes=32 time<1ms TTL=63
Reply from X.X.X.X: bytes=32 time<1ms TTL=63
Reply from X.X.X.X: bytes=32 time=1ms TTL=63
Reply from X.X.X.X: bytes=32 time<1ms TTL=63
Reply from X.X.X.X: bytes=32 time=3ms TTL=63
....


What I've tried:
- Different kernels (2.6.19-2.6.21.2) with native kernel driver, or with
e1000 project latest driver)
- Different e1000 driver versions (7.3.20-7.5.5)
- Booting with "noapic" or acpi=off

None of them helped in any way.

The only workaround I found until now is very unacceptable - booting
without SMP support - "nosmp" kernel option.