Re: Early SPECWeb99 results on 2.5.33 with TSO on e1000

Dave Hansen
2002-09-06T15:34:52Z

Martin J. Bligh wrote:
>>Stupid question, are you sure you have CONFIG_E1000_NAPI enabled?
>>
>>NAPI is also not the panacea to all problems in the world.
>
> No, but I didn't expect throughput to drop by 40% or so either,
> which is (very roughly) what happened. Interrupts are a pain to
> manage and do affinity with, so NAPI should (at least in theory)
> be better for this kind of setup ... I think.

No, no. Bad Martin! Throughput didn't drop, "Specweb compliance" dropped.
Those are two very, very different things. I've found that the server
can produce a lot more throughput, although it doesn't have the
characteristics that Specweb considers compliant. Just have Troy enable
mod-status and look at the throughput that Apache tells you that it is
giving during a run. _That_ is real throughput, not number of compliant
connections.

_And_ NAPI is for receive only, right? Also, my compliance drop occurs
with the NAPI checkbox disabled. There is something else in the new driver
that causes our problems.

--
Dave Hansen
haveblue@us.ibm.com