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Re: [PATCH] Break 'budget' dependency on netdev_max_backlog.

To: jamal <hadi@xxxxxxxxxx>
Subject: Re: [PATCH] Break 'budget' dependency on netdev_max_backlog.
From: Ben Greear <greearb@xxxxxxxxxxxxxxx>
Date: Tue, 22 Oct 2002 20:43:00 -0700
Cc: "'netdev@xxxxxxxxxxx'" <netdev@xxxxxxxxxxx>
Organization: Candela Technologies
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jamal wrote:

On Tue, 22 Oct 2002, Ben Greear wrote:

Think we should add an IOCTL to change the weight of a device
dynamically?  (I want my e1000 and tg3 to have higher weight than
the tulip nics, I imagine)

Is there a ready-built proc interface to do things to individual devices?

tulip hardcodes it; net/core/dev.c::weight_p is supposed to be the general
one and is proc settable via NET_CORE_DEV_WEIGHT; only problem is that
is not shadowed by the devices.
I am not sure if ioctls or module parameters are the best way to override
the default weight_p value. Somehow we need something to set this value.

No reason not to provide both! The IOCTL can take care of any drivers that don't take module parameters for it, and can do it in a generic way.

The tulip driver I am poking at hard-coded it to 16.  64 seems to work
just as good.

Any idea (other than trial and error) for how to determine a good value
for this?  Maybe should take the number of active devices into account
and wiggle things dynamically from user-space?


cheers, jamal

Ben Greear <greearb@xxxxxxxxxxxxxxx>       <Ben_Greear AT>
President of Candela Technologies Inc

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