netdev - Re: BW regression after "tcp: refine TSO autosizing"

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Date:	Tue, 20 Jan 2015 11:26:31 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Rick Jones <rick.jones2@...com>
Cc:	Dave Taht <dave.taht@...il.com>, Eyal Perry <eyalpe@...lanox.com>,
	Yuchung Cheng <ycheng@...gle.com>,
	Neal Cardwell <ncardwell@...gle.com>,
	Eyal Perry <eyalpe@....mellanox.co.il>,
	Or Gerlitz <gerlitz.or@...il.com>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Amir Vadai <amirv@...lanox.com>,
	Yevgeny Petrilin <yevgenyp@...lanox.com>,
	Saeed Mahameed <saeedm@...lanox.com>,
	Ido Shamay <idos@...lanox.com>, Amir Ancel <amira@...lanox.com>
Subject: Re: BW regression after "tcp: refine TSO autosizing"

On Tue, 2015-01-20 at 11:14 -0800, Rick Jones wrote:

> > Thats a 3 lines patch in netperf actually.
> 
> More stuff to pull from a TCP_INFO call I presume?  Feel free to drop me 
> a patch, though I'd probably want it to be in the guise of the omni 
> output selectors.
> 

It was something like :

diff --git a/src/nettest_omni.c b/src/nettest_omni.c
index fb2d5f4..80e43ca 100644
--- a/src/nettest_omni.c
+++ b/src/nettest_omni.c
@@ -3465,7 +3465,7 @@ static void
 dump_tcp_info(struct tcp_info *tcp_info)
 {
 
-  printf("tcpi_rto %d tcpi_ato %d tcpi_pmtu %d tcpi_rcv_ssthresh %d\n"
+  fprintf(stderr, "tcpi_rto %d tcpi_ato %d tcpi_pmtu %d tcpi_rcv_ssthresh %d\n"
         "tcpi_rtt %d tcpi_rttvar %d tcpi_snd_ssthresh %d tpci_snd_cwnd %d\n"
         "tcpi_reordering %d tcpi_total_retrans %d\n",
         tcp_info->tcpi_rto,
@@ -3539,7 +3539,7 @@ get_transport_retrans(SOCKET socket, int protocol) {
   }
   else {
 
-    if (debug > 1) {
+    if (debug > 1 || getenv("DUMP_TCP_INFO")) {
       dump_tcp_info(&tcp_info);
     }
     return tcp_info.tcpi_total_retrans;


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