netdev - Re: [PATCH 1/3] net: tcp: make hybla selectable as default congestion module

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Date:	Thu, 11 Mar 2010 21:19:24 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Stephen Hemminger <shemminger@...tta.com>
cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH 1/3] net: tcp: make hybla selectable as default congestion
 module


On Thursday 2010-03-11 21:10, Stephen Hemminger wrote:
>> 
>> diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
>> index 0c94a1a..731c47b 100644
>> --- a/net/ipv4/Kconfig
>> +++ b/net/ipv4/Kconfig
>> @@ -587,6 +587,9 @@ choice
>>  	config DEFAULT_HTCP
>>  		bool "Htcp" if TCP_CONG_HTCP=y
>>  
>> +	config DEFAULT_HYBLA
>> +		bool "Hybla" if TCP_CONG_HYBLA=y
>> +
>>  	config DEFAULT_VEGAS
>>  		bool "Vegas" if TCP_CONG_VEGAS=y
>>  
>> @@ -610,6 +613,7 @@ config DEFAULT_TCP_CONG
>>  	default "bic" if DEFAULT_BIC
>>  	default "cubic" if DEFAULT_CUBIC
>>  	default "htcp" if DEFAULT_HTCP
>> +	default "hybla" if DEFAULT_HYBLA
>>  	default "vegas" if DEFAULT_VEGAS
>>  	default "westwood" if DEFAULT_WESTWOOD
>>  	default "reno" if DEFAULT_RENO
>
>Hybla seems too experimental to be made default.

I run Hybla since 2006 on anything that is not connected via
wireless and I did not notice any pressing issues.

Also, the patch does not make hybla the default default (reno remains),
just the default once explicitly selected in a two-step process:

1. CONFIG_TCP_CONG_HYBLA=y
*and*
2. choosing Hybla in CONFIG_DEFAULT_TCP_CONG

I think that is enough of a "safety measure" against any potential
unsuspecting users.
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