Network interface - allow to set kernel default qlen value

Network interface - allow to set kernel default qlen value

[Jarosław Kłopotek]

Welcome netdev's,
is it possible to set in kernel default (for example by sysctl) value of 
qlen parameter for network interfaces?

I try to search: sysctl -a | grep qlen | grep default
and didn't find anything.

Now for setting the qlen - we use scripts in /etc/network/interface.

This is not so important thing - but could be improved. What do You 
think about it?

-- 
Jarosław Kłopotek
kom. 607 893 111
Interduo Bujek Kłopotek Sowa sp.j.
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Re: Network interface - allow to set kernel default qlen value

[Jakub Kicinski]

On Mon, 22 Aug 2022 10:41:40 +0200 Jarosław Kłopotek wrote:
> Welcome netdev's,
> is it possible to set in kernel default (for example by sysctl) value of 
> qlen parameter for network interfaces?
> 
> I try to search: sysctl -a | grep qlen | grep default
> and didn't find anything.
> 
> Now for setting the qlen - we use scripts in /etc/network/interface.
> 
> This is not so important thing - but could be improved. What do You 
> think about it?

What type of network interfaces are we talking about here?
Physical Ethernet links?

Re: Network interface - allow to set kernel default qlen value

[Jarosław Kłopotek]

W dniu 23.08.2022 o 02:36, Jakub Kicinski pisze:
> On Mon, 22 Aug 2022 10:41:40 +0200 Jarosław Kłopotek wrote:
>> Welcome netdev's,
>> is it possible to set in kernel default (for example by sysctl) value of
>> qlen parameter for network interfaces?
>>
>> I try to search: sysctl -a | grep qlen | grep default
>> and didn't find anything.
>>
>> Now for setting the qlen - we use scripts in /etc/network/interface.
>>
>> This is not so important thing - but could be improved. What do You
>> think about it?
> What type of network interfaces are we talking about here?
> Physical Ethernet links?

Ethernet links - for example:

ip a s | grep qlen

for example:
119: ens16np0.1231@ens16np0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 
qdisc noqueue state UP group default qlen 10000
(...)

-- 
Jarosław Kłopotek
kom. 607 893 111
Interduo Bujek Kłopotek Sowa sp.j.
ul. Krańcowa 17, 21-100 Lubartów
tel. 81 475 30 00

Re: Network interface - allow to set kernel default qlen value

[Jakub Kicinski]

On Tue, 23 Aug 2022 09:59:07 +0200 Jarosław Kłopotek wrote:
> W dniu 23.08.2022 o 02:36, Jakub Kicinski pisze:
> > On Mon, 22 Aug 2022 10:41:40 +0200 Jarosław Kłopotek wrote:  
> >> Welcome netdev's,
> >> is it possible to set in kernel default (for example by sysctl) value of
> >> qlen parameter for network interfaces?
> >>
> >> I try to search: sysctl -a | grep qlen | grep default
> >> and didn't find anything.
> >>
> >> Now for setting the qlen - we use scripts in /etc/network/interface.
> >>
> >> This is not so important thing - but could be improved. What do You
> >> think about it?  
> > What type of network interfaces are we talking about here?
> > Physical Ethernet links?  
> 
> Ethernet links - for example:
> 
> ip a s | grep qlen
> 
> for example:
> 119: ens16np0.1231@ens16np0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 
> qdisc noqueue state UP group default qlen 10000

That looks like a vlan, or some such. I don't think changing qlen with
"noqueue" does anything.

Re: Network interface - allow to set kernel default qlen value

[Cong Wang]

On Mon, Aug 22, 2022 at 10:41:40AM +0200, Jarosław Kłopotek wrote:
> Welcome netdev's,
> is it possible to set in kernel default (for example by sysctl) value of
> qlen parameter for network interfaces?
> 
> I try to search: sysctl -a | grep qlen | grep default
> and didn't find anything.
> 
> Now for setting the qlen - we use scripts in /etc/network/interface.
> 
> This is not so important thing - but could be improved. What do You think
> about it?
> 

I have to ask, what is wrong with setting it in your ifup script after
it is created/probed?