Re: HEADS-UP: IFLIB implementations of sys/dev/e1000 em, lem, igb pending

On 01/11/17 12:47, Olivier Cochard-Labbé wrote:
> On Wed, Jan 11, 2017 at 4:17 PM, Sean Bruno <sbruno_at_freebsd.org
> <mailto:sbruno_at_freebsd.org>> wrote:
> 
> 
> 
>     Olivier:
> 
>     Give this a quick try.  This isn't the correct way to do this, but I
>     want to see if I'm on the right path:
> 
> 
> ​thanks, it fix the problem, I've got back the 4 queues:​
> 
> ​igb2: <Intel(R) PRO/1000 PCI-Express Network Driver> port 0x3000-0x301f
> mem 0xdfea0000-0xdfebffff,0xdff24000-0xdff27fff irq 18 at device 20.0 on
> pci0
> igb2: attach_pre capping queues at 8
> igb2: using 1024 tx descriptors and 1024 rx descriptors
> igb2: msix_init qsets capped at 8
> igb2: pxm cpus: 4 queue msgs: 9 admincnt: 1
> igb2: using 4 rx queues 4 tx queues
> igb2: Using MSIX interrupts with 5 vectors
> igb2: allocated for 4 tx_queues
> igb2: allocated for 4 rx_queues
> igb2: Ethernet address: 00:08:a2:09:33:da
> igb2: netmap queues/slots: TX 4/1024, RX 4/1024
> ​
> In forwarding mode, I measure about 10% performance drop with this new
> drivers on this hardware:
> 
> x head r311848: packets per second
> + head r311849 and BAR patch: packets per second
> +--------------------------------------------------------------------------+
> |++    ++ +                                                   xxx     x   x|
> |                                                            |__M__A____|  |
> | |___AM__|                                                                |
> +--------------------------------------------------------------------------+
>     N           Min           Max        Median           Avg        Stddev
> x   5        924170        943071        927509      931612.1     8096.8269
> +   5        831452      845929.5        840940      838730.5     6413.5602
> Difference at 95.0% confidence
>         -92881.6 +/- 10652.2
>         -9.96999% +/- 1.07481%
>         (Student's t, pooled s = 7303.85)
> 
> Regards,
> 
> Olivier
> 


Hmmm ... did your old tests do 4 or 8 queues on this hardware?

Did the old tests run 1024 tx/rx slots or the max 4096?

sean