[USRP-users] Unable to permanently set UHD maximum buffer size
Marcus D. Leech
mleech at ripnet.com
Thu Jul 16 19:29:59 EDT 2015
On 07/16/2015 07:23 PM, John Petrich via USRP-users wrote:
> /UHD_USRP_probe / outputs a UHD warning that the receive buffer should
> be resized to 50e6. Following the
> http://files.ettus.com/manual/page_transport.html documentation, I
> have been unable to permanently set the maximum /rmem /buffer size.
> The /wmem /buffer size appears to be permanently set. Using Ubuntu
> 14.04 LTS OS. The /sysctl.conf /directory is not natively present in
> my OS.
> I performed /mkdir sysctl.conf/ in the /etc /directory. Using /sudo
> nano net.core.rmem_max=50000000 /to access a text editor, I was able
> to include the text file < /net.core.rmem_max=50000000> / in the
> /sysctl.conf /directory. The /rmem /maximum buffer size is not
> permanently set and the UHD warning continues to appear at every reboot.
> Any suggestions? Is the /sysctl.conf/ directory correctly placed in
> the /etc /directory in my Ubuntu OS? Is the text file
> </net.core.rmem_max=50000000> / correct? What have I forgotten to
> do? Any ideas why the /wmem /buffer size appears to be permanently
> set but not the /rmem/ buffer size?
> John Petrich
> USRP-users mailing list
> USRP-users at lists.ettus.com
sysctl.conf is a regular *file*, generally.
Here's the contents of my /etc/sysctl.conf
# System default settings live in /usr/lib/sysctl.d/00-system.conf.
# To override those settings, enter new settings here, or in an
# For more information, see sysctl.conf(5) and sysctl.d(5).
# Updates for Gnu Radio
net.core.rmem_max = 1000000
net.core.wmem_max = 1000000
kernel.shmmax = 2147483648
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