linux-kernel - Re: [dpdk-dev] [PATCH 0/2] uio

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Message-ID: <20151001170403.1ba4dad3@urahara>
Date:	Thu, 1 Oct 2015 17:04:03 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Alexander Duyck <alexander.duyck@...il.com>
Cc:	Avi Kivity <avi@...lladb.com>, dev@...k.org, hjk@...sjkoch.de,
	gregkh@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [dpdk-dev] [PATCH 0/2] uio_msi: device driver

On Thu, 1 Oct 2015 16:43:23 -0700
Alexander Duyck <alexander.duyck@...il.com> wrote:

> Yes, but in the case of something like a VF it is going to just make a 
> bigger mess of things since INTx doesn't work.  So what would you expect 
> your driver to do in that case?  Also we have to keep in mind that the 
> MSI-X failure case is very unlikely.
> 
> One other thing that just occurred to me is that you may want to try 
> using the range allocation call instead of a hard set number of 
> interrupts.  Then if you start running short on vectors you don't hard 
> fail and instead just allocate what you can.

I tried that but the bookkeeping gets messy since there is no good
way to communicate that back to userspace and have it adapt.
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