On 05/10/2019 08:07 AM, Disco Daniele via USRP-users wrote:
OK!
Thank you Johannes for your clarifications!
Now I know that this is, as you say, the << intended behavior >>.
Best Regards
Daniele
Check for an overriding value in /etc/sysctl.conf.d in one of the files
there.
If you just modified /etc/sys.conf, but there's another .conf file in
/etc/sysctl.conf.d that specifies the same value, the one from
/etc/sysctl.conf.d takes precedence.
-----Original Message-----
From: USRP-users [mailto:usrp-users-boun...@lists.ettus.com] On Behalf Of
Johannes Demel via USRP-users
Sent: venerdì 10 maggio 2019 11:39
To: usrp-users@lists.ettus.com
Subject: Re: [USRP-users] [EXT] Re: Configuration in sysctl.conf
Hi Daniele,
all of what you describe is intended behavior.
First off, UHD tells you *exactly* what to do. Run:
`sudo sysctl -w net.core.wmem_max=24862979` Nothing else. Just copy the
previous line without the ``.
The same goes for the rmem part.
These changes are valid as long as your machine runs. It is not a permanent
change. Thus, you need to rerun this command after every reboot. This is also
intended. Reasonable defaults are set for your everyday use. UHD does stress
the network quite a lot with a lot of IQ samples, thus, you see a warning that
tells you what to do to improve performance. Other applications might work
worse then. But as long as you want to use a USRP and UHD, this is fine.
The whole `/proc` folder structure exists for the purpose that your Linux
kernel communicates information to you. Lots of tools make use of that [0].
This is nothing UHD related but Linux in general. Certainly worthwhile to learn
about it.
Starting from there, you can figure out what the actual command does and how
you would proceed if you would want to make this change permanent.
Cheers
Johannes
[0] https://en.wikipedia.org/wiki/Procfs
Am 09.05.19 um 16:40 schrieb Disco Daniele via USRP-users:
The number that seems configured every time I run uhd_usrp_probe is
1048576 that is the value present in the file wmem_max in the
directory
/proc/sys/net/core/
I searched also the way to modify this value and I found:
sudo -s -H
echo 24862979 > /proc/sys/net/core/wmem_max
If now I test the number present in the file:
cat /proc/sys/net/core/wmem_max
the result is 24862979
and the command uhd_usrp_probe does not report warning.
But if I restart the linux box,
cat /proc/sys/net/core/wmem_max
produce 1048576 again
*From:*USRP-users [mailto:usrp-users-boun...@lists.ettus.com] *On
Behalf Of *Rob Kossler via USRP-users
*Sent:* giovedì 9 maggio 2019 16:28
*To:* Marcus D. Leech <patchvonbr...@gmail.com>
*Cc:* usrp-users <usrp-users@lists.ettus.com>
*Subject:* [EXT] Re: [USRP-users] Configuration in sysctl.conf
Have you done the same for "rmem_max"? Perhaps the continued warning
messages are related to this rather than wmem_max?
Rob
On Thu, May 9, 2019 at 10:01 AM Marcus D. Leech via USRP-users
<usrp-users@lists.ettus.com <mailto:usrp-users@lists.ettus.com>> wrote:
On 05/09/2019 08:25 AM, Disco Daniele via USRP-users wrote:
Hi!
I’m using a X310 on a linux box UBUNTU 18.04
Executing the command “uhd_usrp_probe”
I obtain a lot of [WARNING][UDP] related to the dimension of the
send buffer
Then there is the sentence:
Please run: sudo sysctl -w net.core.wmem_max=24862979
So I’ve written in the file /etc/sysctl.conf, at the end
net.core.wmem_max=24862979
I restarted the host but rerunning uhd_usrp_probe I reobtain the
same warning.
Could you help me?
PS: Now I’m using a 10GB Ethernet board plugged in the
workstation, using a couple of fiber optics between the X310 and
the work station
Thank you
Perhaps you have a syntax error in your sysctl file?
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