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SubjectRe: [RFC PATCH 0/5] net: low latency Ethernet device polling
On 01/03/2013 23:24, David Miller wrote:
> From: Eliezer Tamir <>
> Date: Wed, 27 Feb 2013 09:55:49 -0800
>> This patchset adds the ability for the socket layer code to poll directly
>> on an Ethernet device's RX queue. This eliminates the cost of the interrupt
>> and context switch and with proper tuning allows us to get very close
>> to the HW latency.
>> This is a follow up to Jesse Brandeburg's Kernel Plumbers talk from last year
> I just wanted to say that I like this work a lot.
> It proves a lot of things I try to impress upon people who talk about
> how RDMA is such a "must have" because the software stack can't
> possibly give anything near HW latency.
> Obviously such arguments are complete bullshit as is shown by these
> changes.
> This is exactly the kind of approach that makes sense rather than
> trying to put entire TCP stacks in the network card firmware.
> Thanks again for doing this work and I look forward to applying
> this stuff once all the kinks are worked out. The folks in the
> Intel NIC group continue to impress me.

It would really help us to hear opinions on the open issues we listed.


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