netdev - Re: [PATCH net-next] tcp: get rid of sysctl_tcp_adv_win

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Message-ID: <28e2bd4a-3233-471c-a1ae-57a445173401@kernel.org>
Date: Fri, 3 Nov 2023 11:14:56 +0100
From: Jiri Slaby <jirislaby@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>
Cc: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski
 <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
 Soheil Hassas Yeganeh <soheil@...gle.com>,
 Neal Cardwell <ncardwell@...gle.com>, Yuchung Cheng <ycheng@...gle.com>,
 eric.dumazet@...il.com
Subject: Re: [PATCH net-next] tcp: get rid of sysctl_tcp_adv_win_scale

On 03. 11. 23, 9:17, Eric Dumazet wrote:
> What happens if you double /proc/sys/net/ipv4/tcp_wmem  and/or
> /proc/sys/net/ipv4/tcp_rmem first value ?
> (4096 -> 8192)

No change:
# cat /proc/sys/net/ipv4/tcp_wmem
8192    16384   4194304

But this:
# cat /proc/sys/net/ipv4/tcp_rmem
8192    16384   4194304

results in test to run 4.7 s, so even 3 more times slower!

thanks,
-- 
js
suse labs