----- Original Message -----
> From: "Luke Bigum" <luke.bi...@lmax.com>
> To: "linuxptp-users" <linuxptp-users@lists.sourceforge.net>
> Sent: Tuesday, 4 October, 2016 15:18:05
> Subject: Re: [Linuxptp-users] issue with NetXtreme II BCM57810

> ----- Original Message -----
>> From: "Richard Cochran" <richardcoch...@gmail.com>
>> To: "Luke Bigum" <luke.bi...@lmax.com>
>> Cc: "linuxptp-users" <linuxptp-users@lists.sourceforge.net>
>> Sent: Tuesday, 4 October, 2016 14:28:39
>> Subject: Re: [Linuxptp-users] issue with NetXtreme II BCM57810
>> I don't have this card nor was I involved in reviewing the driver.
>> The file, drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c, contains
>> the PHC stuff.
>> Looking at bnx2x_init_cyclecounter(), they have mult = shift = 1.
>> That implies that
>>  nanoseconds = ticks / 2
>> and that their internal clock runs at 2 GHz!
>> Maybe they meant to have shift=0, or maybe your card has a (model
>> specific 1 GHz clock).
>> Anyhow, the testptp result is clear enough.  You should take this up
>> with the driver maintainers.
>> Thanks,
>> Richard
> Thanks Richard, that's helpful. I'll track it down.

For the Internet record, Qlogic have fixed this in version 7.14.05 of their 
10Gig driver pack. I've compiled this bnx2x driver against a 3.18 kernel and 
the PHC advances at regular speed. The source and some binaries are available 


I don't know when they will be added to the mainline kernel.



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