Re: How to enable Adaptive RX on

Re: How to enable Adaptive RX on

[Ben Hutchings]

On Tue, 2013-02-05 at 14:02 -0500, Dhanasekaran Anbalagan wrote:
> Hi,
> 
> We are trying to set Adative RX on, But we unable to set.

Which driver is this ('ethtool -i eth0' will tell you)?

Ben.


-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

Re: How to enable Adaptive RX on

[Ben Hutchings]

On Tue, 2013-02-05 at 14:23 -0500, Dhanasekaran Anbalagan wrote:
> Hi we have the following 
> 
> root@dvcl150:~# ethtool -i eth0 
> driver: igb
> version: 3.2.10-k
> firmware-version: 1.6-1
> bus-info: 0000:04:00.0
> supports-statistics: yes
> supports-test: yes
> supports-eeprom-access: yes
> supports-register-dump: yes

This driver doesn't support adaptive RX IRQ coalescing.  It should
report an error when you try to enable it, but currently just ignores
that setting.

Ben.


-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

Re: How to enable Adaptive RX on

[Dhanasekaran Anbalagan]

[-- Attachment #1.1: Type: text/plain, Size: 1002 bytes --]

Hi Bean,

Is there any specific modules here, we need enable the coalescing,  with
our kernel so the Adaptive RX turn on.

please guide me.

-Dhanasekaran.

Did I learn something today? If not, I wasted it.


On Tue, Feb 5, 2013 at 2:54 PM, Ben Hutchings <bhutchings@solarflare.com>wrote:

> On Tue, 2013-02-05 at 14:23 -0500, Dhanasekaran Anbalagan wrote:
> > Hi we have the following
> >
> > root@dvcl150:~# ethtool -i eth0
> > driver: igb
> > version: 3.2.10-k
> > firmware-version: 1.6-1
> > bus-info: 0000:04:00.0
> > supports-statistics: yes
> > supports-test: yes
> > supports-eeprom-access: yes
> > supports-register-dump: yes
>
> This driver doesn't support adaptive RX IRQ coalescing.  It should
> report an error when you try to enable it, but currently just ignores
> that setting.
>
> Ben.
>
>
> --
> Ben Hutchings, Staff Engineer, Solarflare
> Not speaking for my employer; that's the marketing department's job.
> They asked us to note that Solarflare product names are trademarked.
>
>

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RE: [E1000-devel] How to enable Adaptive RX on

[Wyborny, Carolyn]

> -----Original Message-----
> From: Dhanasekaran Anbalagan [mailto:bugcy013@gmail.com]
> Sent: Tuesday, February 05, 2013 12:14 PM
> To: Ben Hutchings
> Cc: e1000-devel; netdev
> Subject: Re: [E1000-devel] How to enable Adaptive RX on
> 
> Hi Bean,
> 
> Is there any specific modules here, we need enable the coalescing,  with our
> kernel so the Adaptive RX turn on.
> 
> please guide me.

I am the igb driver owner at Intel.  Ben is correct, igb does not have an adaptive coalescing implementation.  We have implemented instead the rx_usecs parameter you can use to set an interrupt rate that optimizes your traffic scenario.  Start with a value in the range of 2000 to 3000 and adjust up or down in order to find the best setting.  You will be likely wanting maximum throughput without too much cpu utilization.

Thanks,

Carolyn

Carolyn Wyborny 
Linux Development 
Networking Division 
Intel Corporation