ixl 40G bad performance?

[Eggert, Lars]

On 2015-10-24, at 10:32, Jack Vogel <jfvogel at gmail.com> wrote:
> 13 on a 40G interface?? I don't think that's very good for Linux either, is
> this a 4x10 adapter?

No, its's a 2x40. And I can get it into the high 30s with tuning. I just mentioned the value to illustrate that something seems to be seriously broken under FreeBSD.

Lars

> Maybe elaborating on the details of the hardware, you sure you don't have a
> bad PCI slot
> somewhere that might be throttling everything?
> 
> Cheers,
> 
> Jack
> 
> 
> On Sat, Oct 24, 2015 at 12:43 AM, Eggert, Lars <lars at netapp.com> wrote:
> 
>> On 2015-10-23, at 23:36, Eric Joyner <erj at freebsd.org> wrote:
>> 
>> I see that the sysctl does clobber the global value, but have you tried
>> lowering the interval / raising the rate? You could try something like
>> 10usecs, and see if that helps. We'll do some more investigation here --
>> 3Gb/s on a 40Gb/s using default settings is terrible, and we shouldn't let
>> that be happening.
>> 
>> 
>> I played with different settings, but I've never been able to get more
>> than 4Gb/s, whereas under Linux 4.2 without any special settings I get 13.
>> 
>> See my other email on TSO/LRO not looking to be effective; that would
>> certainly explain it. Plausible? Anything to try here?
>> 
>> Lars
>> 
>> 
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