[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Fwd: [Discuss-gnuradio] USRP2 eth_buffer

From: Eric Blossom
Subject: Re: Fwd: [Discuss-gnuradio] USRP2 eth_buffer
Date: Thu, 23 Apr 2009 21:40:49 -0700
User-agent: Mutt/1.5.18 (2008-05-17)

On Thu, Apr 23, 2009 at 01:15:56PM +0300, Juha Vierinen wrote:
> I have attached a patch to allow users to define the ethernet packet
> ring size. I remove the SLAB_SIZE restriction. I think gnuradio needs
> a fairly new >2.6.5 kernel anyway.
> Why is this needed? I challenge anyone to sample at 25 MHz
> continuously for two hours without overruns or missing packets to a
> five disk raid array (be it ext2 or anything else) with the default 25
> MB buffer.
> Still, the patch maintains the original 25e6 buffer size. A value of
> 250e6 to 500e6 allows fairly reliable sampling to disk at 25 MHz, so I
> recommend increasing the default buffer size to something higher than
> 25 MB. Otherwise new users will have problems with overruns. Even
> Firefox consumes hundreds of megabytes.
> juha

Juha, thanks for the patch!


reply via email to

[Prev in Thread] Current Thread [Next in Thread]