freebsd stable - Aug 2015 - ix(intel) vs mlxen(mellanox) 10Gb performance

On 17 August 2015 at 13:39, Slawa Olhovchenkov <slw at zxy.spb.ru> wrote:
> In any case, for 10Gb expect about 1200MGB/s.
Your usage of units is confusing. Above you claim you expect 1200
million gigabytes per second, or 1.2 * 10^18 Bytes/s. I don't think
any known network interface can do that, including highly experimental
ones.

I suspect you intended to claim that you expect 1.2GB/s (Gigabytes per
second) over that 10Gb/s (Gigabits per second) network.
That's still on the high side of what's possible. On TCP/IP there is
some TCP overhead, so 1.0 GB/s is probably more realistic.

WRT the actual problem you're trying to solve, I'm no help there.
-- 
If you can't see the forest for the trees,
Cut the trees and you'll see there is no forest.

On Mon, Aug 17, 2015 at 01:49:27PM +0200, Alban Hertroys wrote:
> On 17 August 2015 at 13:39, Slawa Olhovchenkov <slw at zxy.spb.ru>
wrote:
> 
> > In any case, for 10Gb expect about 1200MGB/s.
> 
> Your usage of units is confusing. Above you claim you expect 1200
I am use as topic starter and expect MeGaBytes per second
> million gigabytes per second, or 1.2 * 10^18 Bytes/s. I don't think
> any known network interface can do that, including highly experimental
> ones.
> 
> I suspect you intended to claim that you expect 1.2GB/s (Gigabytes per
> second) over that 10Gb/s (Gigabits per second) network.
> That's still on the high side of what's possible. On TCP/IP there
is
> some TCP overhead, so 1.0 GB/s is probably more realistic.
TCP give 5-7% overhead (include retrasmits).
10^9/8*0.97 = 1.2125