From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bobcat.rjmcmahon.com (bobcat.rjmcmahon.com [45.33.58.123]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 958F71CD3B for ; Sat, 11 May 2024 21:01:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.33.58.123 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715461318; cv=none; b=N4nr7GwpNEkILDkTIkV0hiehbSb6GTuRtTn6y8bU6zqCDe1VyRI25Z1edKPrIUWheiRC84Z7LEPziZQihB5FjLwL8XKjzq8Tq152WNXv5n/O3hbiJ6U959KmvHXt6KgqTVkxv0+GuiyHst7/B7DncHJbb57HUEBgYh6uTVB+b28= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715461318; c=relaxed/simple; bh=D1BUHWgSXd6+/ewuX2WsHeRgbc4hgL4d4s0JnSWNLoI=; h=MIME-Version:From:Date:Message-ID:Subject:To:Content-Type; b=f1IDEi4YjAQSKz0CrZjB8Ybw06i6Xh8GkXc5TRYlGl3TAdvugkHt081K/QKxv0BkjbpNTuFREHig1pe8+vsRZLWUaXpAEPnd1fPzz4qiFn8dKYjP642PCQQQcSC9lsFrsfz3rqanX7hvc6+D0z4VFEMXbE7zGobKAg85mAeFad8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=rjmcmahon.com; spf=pass smtp.mailfrom=rjmcmahon.com; dkim=pass (1024-bit key) header.d=rjmcmahon.com header.i=@rjmcmahon.com header.b=l4Y2aN11; arc=none smtp.client-ip=45.33.58.123 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=rjmcmahon.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rjmcmahon.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=rjmcmahon.com header.i=@rjmcmahon.com header.b="l4Y2aN11" Received: from mail-yb1-f177.google.com (mail-yb1-f177.google.com [209.85.219.177]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by bobcat.rjmcmahon.com (Postfix) with ESMTPSA id 020951B4EC for ; Sat, 11 May 2024 13:52:20 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 bobcat.rjmcmahon.com 020951B4EC DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rjmcmahon.com; s=bobcat; t=1715460741; bh=sJ6jX2SZeZ27xbPP+zOqZQvylZuwfGUR2IzubPNoaQM=; h=From:Date:Subject:To:From; b=l4Y2aN11M5JwdfQ6j1PTvTe4XdCxssgi8dAxbuiDgrTjMMYek2ECvIowgSp1+t2s8 o1H/l/anhCXI6PNuRnUQP0Sfq3/DKqJjEROSwELk0IuV6bXepyJ+v7wR01PqQLG4bO Q1ctMZEm6Sa9Wxs9YKisTBTSoxHlSARpSAfbaxQY= Received: by mail-yb1-f177.google.com with SMTP id 3f1490d57ef6-de60d05adafso3055966276.2 for ; Sat, 11 May 2024 13:52:20 -0700 (PDT) X-Gm-Message-State: AOJu0YwKRXUAf+Vn/BqIUB6wYa9F+Unn8TR4tKUsultY90SPG0RiKHju Kwdjk+Bway6R7EfPkn4dxxo4FH65h+GuZ9e4hjxmrwS/Wm731G9ovmGZDFmETrWxlNzen425Z98 /0EJBv1knPrP6H1zl9BN4FD6nntU= X-Google-Smtp-Source: AGHT+IFM+yLXPADzobY9zupY7Fmq4dAh+wGcEbpi5S+aH3XrqvGc2naqWrdHnDSskM3EuyTLqcL4SttzROmp7LxN6qY= X-Received: by 2002:a05:6902:110:b0:de6:b58:fe72 with SMTP id 3f1490d57ef6-dee4f4ed89emr5658566276.58.1715460740095; Sat, 11 May 2024 13:52:20 -0700 (PDT) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Robert McMahon Date: Sat, 11 May 2024 13:52:09 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Feedback request: iperf 2 asymmetric bounceback outputs To: netdev@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Hi All, One feature of iperf 2's bouncecback is the asymmetric write size between the request and reply. I'm considering the output as shown below. The transfer values include both directions. The per direction is bytes only. Comments are welcome. rjmcmahon@fedora:~/Code/bb/iperf2-code$ src/iperf -c 127.0.0.1 -e -i 1 -t 3 --bounceback=1 --bounceback-period 0 --bounceback-request 1000 --bounceback-reply 500 ------------------------------------------------------------ Client connecting to 127.0.0.1, TCP port 5001 with pid 63480 (1/0 flows/load) Bounceback test (req/reply size =1000 Byte/ 500 Byte) (server hold req=0 usecs & tcp_quickack) TCP congestion control using cubic TOS defaults to 0x0 (dscp=0,ecn=0) and nodelay (Nagle off) TCP window size: 2.50 MByte (default) ------------------------------------------------------------ [ 1] local 127.0.0.1%lo port 47210 connected with 127.0.0.1 port 5001 (bb w/quickack req/reply/hold=1000/500/0) (icwnd/mss/irtt=162/16640/32) (ct=0.08 ms) on 2024-05-11 13:27:11.441673 (PDT) [ ID] Interval Transfer Bandwidth BB cnt=avg/min/max/stdev Rtry Cwnd(pkts)/RTT(var) Tx/Rx bytes RPS(avg) [ 1] 0.00-1.00 sec 63.2 MBytes 530 Mbits/sec 44171=0.022/0.016/0.389/0.003 ms 0 639K/(10)/13(0) us Tx=42.1 MByte Rx=21.1 MByte RPS=46006 [ 1] 1.00-2.00 sec 45.3 MBytes 380 Mbits/sec 31671=0.030/0.022/0.086/0.007 ms 0 639K/(10)/19(0) us Tx=30.2 MByte Rx=15.1 MByte RPS=32967 [ 1] 2.00-3.00 sec 38.0 MBytes 319 Mbits/sec 26581=0.036/0.031/0.077/0.003 ms 0 639K/(10)/19(1) us Tx=25.3 MByte Rx=12.7 MByte RPS=27715 [ 1] 0.00-3.01 sec 147 MBytes 408 Mbits/sec 102424=0.028/0.016/0.389/0.008 ms 0 -(-)/-(-) Tx=97.7 MByte Rx=48.8 MByte RPS=35565 [ 1] 0.00-3.01 sec BB8(f)-PDF: bin(w=100us):cnt(102424)=1:102421,2:1,4:2 (5.00/95.00/99.7%=1/1/1,Outliers=0,obl/obu=0/0) Thanks in advance for any comments, Bob