Re: Multiport NICs - VLAN and Polling Support?

From: Kurt Jaeger (lists_at_complx.LF.net)
Date: 10/14/05

  • Next message: Drew Linsalata: "Re: Multiport NICs - VLAN and Polling Support?" 
    Date: Fri, 14 Oct 2005 20:12:39 +0200
To: Danial Thom <danial_thom@yahoo.com>

    Hi!

    > polling is almost never a performance advantage
    > for ethernet, as virtually all modern controllers
    > have some sort of interrupt moderation built-in.

    We had the case on fbsd 5.4p7 with SMP where bge drivers produced
    much slower throughput if we did not use polling. We measured using
    ttcp and the difference was from 2-3Mbyte/sec to 11 Mbyte/sec.

    Yes, it used more CPU, but for that increase in throughput, it
    was worth the expense.

    So it looks a bit strange from my part of the world to. 

    -- 
MfG/Best regards, Kurt Jaeger                                  15 years to go !
LF.net GmbH        fon +49 711 90074-23  pi@LF.net  
Ruppmannstr. 27    fax +49 711 90074-33
D-70565 Stuttgart  mob +49 171 3101372
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  • Next message: Drew Linsalata: "Re: Multiport NICs - VLAN and Polling Support?"