netdev - Re: [RFC PATCH 00/17] virtual-bus

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Message-ID: <49D4D075.9010702@codemonkey.ws>
Date:	Thu, 02 Apr 2009 09:49:25 -0500
From:	Anthony Liguori <anthony@...emonkey.ws>
To:	Avi Kivity <avi@...hat.com>
CC:	Gregory Haskins <ghaskins@...ell.com>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	agraf@...e.de, pmullaney@...ell.com, pmorreale@...ell.com,
	rusty@...tcorp.com.au, netdev@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [RFC PATCH 00/17] virtual-bus

Avi Kivity wrote:
> Avi Kivity wrote:
>>
>> The alternative is to get a notification from the stack that the 
>> packet is done processing.  Either an skb destructor in the kernel, 
>> or my new API that everyone is not rushing out to implement.
>
> btw, my new api is
>
>
>   io_submit(..., nr, ...): submit nr packets
>   io_getevents(): complete nr packets

I don't think we even need that to end this debate.  I'm convinced we 
have a bug somewhere.  Even disabling TX mitigation, I see a ping 
latency of around 300ns whereas it's only 50ns on the host.  This defies 
logic so I'm now looking to isolate why that is.

Regards,

Anthony Liguori

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