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Re: Packet mmap: TX RING and zero copy

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From: Evgeniy Polyakov
Subject: Re: Packet mmap: TX RING and zero copy
Date: Wednesday, September 3, 2008 - 6:27 am

Hi Johann.

On Wed, Sep 03, 2008 at 03:05:07PM +0200, Johann Baudy (johaahn@gmail.com) wrote:

And _THIS_ is a serious problem. Let's assume that sendfile is broken or
driver/hardware does not support scatter/gather and checksumming (does it?).
Can you saturate the link with pktgen (1) and usual tcp socket (2).
Assuming second case will fail, does it also broken because of very
small performance of the copy from the userspace?

-- 
	Evgeniy Polyakov
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Messages in current thread:
Packet mmap: TX RING and zero copy, Johann Baudy, (Tue Sep 2, 11:27 am)
Re: Packet mmap: TX RING and zero copy, Evgeniy Polyakov, (Tue Sep 2, 12:46 pm)
Re: Packet mmap: TX RING and zero copy, Johann Baudy, (Wed Sep 3, 12:56 am)
Re: Packet mmap: TX RING and zero copy, Johann Baudy, (Wed Sep 3, 3:38 am)
Re: Packet mmap: TX RING and zero copy, David Miller, (Wed Sep 3, 4:06 am)
Re: Packet mmap: TX RING and zero copy, Johann Baudy, (Wed Sep 3, 6:05 am)
Re: Packet mmap: TX RING and zero copy, Evgeniy Polyakov, (Wed Sep 3, 6:27 am)
Re: Packet mmap: TX RING and zero copy, Christoph Lameter, (Wed Sep 3, 7:57 am)
Re: Packet mmap: TX RING and zero copy, Johann Baudy, (Wed Sep 3, 8:00 am)
Re: Packet mmap: TX RING and zero copy, Evgeniy Polyakov, (Wed Sep 3, 8:13 am)
Re: Packet mmap: TX RING and zero copy, Johann Baudy, (Wed Sep 3, 8:58 am)
Re: Packet mmap: TX RING and zero copy, Evgeniy Polyakov, (Wed Sep 3, 9:43 am)
Re: Packet mmap: TX RING and zero copy, Johann Baudy, (Wed Sep 3, 1:30 pm)
Re: Packet mmap: TX RING and zero copy, Evgeniy Polyakov, (Wed Sep 3, 3:03 pm)
Re: Packet mmap: TX RING and zero copy, Johann Baudy, (Thu Sep 4, 7:44 am)
Re: Packet mmap: TX RING and zero copy, Evgeniy Polyakov, (Fri Sep 5, 12:17 am)
Re: Packet mmap: TX RING and zero copy, Robert Iakobashvili, (Fri Sep 5, 3:28 am)
Re: Packet mmap: TX RING and zero copy, Johann Baudy, (Fri Sep 5, 6:06 am)