netdev - Re: [PATCHv6 net-next 20/31] iw_cxgb4: adjust tcp snd/rcv window based on link speed

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Date:	Wed, 12 Mar 2014 16:23:48 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	swise@...ngridcomputing.com
Cc:	hariprasad@...lsio.com, netdev@...r.kernel.org,
	linux-rdma@...r.kernel.org, roland@...estorage.com, dm@...lsio.com,
	leedom@...lsio.com, santosh@...lsio.com, kumaras@...lsio.com,
	nirranjan@...lsio.com
Subject: Re: [PATCHv6 net-next 20/31] iw_cxgb4: adjust tcp snd/rcv window
 based on link speed

From: "Steve Wise" <swise@...ngridcomputing.com>
Date: Wed, 12 Mar 2014 15:08:33 -0500

>> > Added module option named adjust_win, defaulted to 1, that allows
>> > disabling the 40G window bump.  This allows a user to specify the exact
>> > default window sizes via module options snd_win and rcv_win.
>> 
>> This is terrible.  As is the existing other TCP tweaking module
>> parameters.
>> 
>> You can just use the TCP settings the kernel already provides for
>> the real TCP stack.
> 
> Do you mean use sysctl_tcp_*mem, sysctl_tcp_timestamps, sysctl_tcp_window_scaling, etc?
> I'll look into this.  

And the socket memory limits, which we use to compute default window
sizes.
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