ixl 40G bad performance?

[Jack Vogel]

13 on a 40G interface?? I don't think that's very good for Linux either, is
this a 4x10 adapter?
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
>
>