Hi,
I go through iperf source code. I want to discuss some observation .
In Unidirectional case sending side loop run more iteration as compared to
Bidirectional sending side.Due to this less data
transfer in bidirectional case. Now I does not get reason why it run less
iteration whereas time for loop run is same in both cases ? and How this
reason affects bidirectional sending side performance ?
Regards
Varun
On Sun, Feb 23, 2014 at 2:02 AM, Sandro Bureca <[email protected]> wrote:
> Hi,
> do you have any kind of iptables or packet filtering mechanism on the
> machine ?
> even if all traffic is permitted it might affect somehow the tcp flow.
> Someone tunes the tcp stack with
> ifconfig buffer
> and sysctrl
>
> See also:
> http://dak1n1.com/blog/7-performance-tuning-intel-10gbe
>
>
>
> Kind regards,
> Sandro
>
> On 21 February 2014 18:54, Varun Sharma <[email protected]> wrote:
> > With UDP packets It's work fine.
> > When I perform tcp bi-directional test for loop back interface (means on
> > same machine server and client exists), same decrease in tcp sending side
> > happen. Is it mean problem related with TCP/IP stack ?
> >
> >
> > On Thu, Feb 20, 2014 at 11:46 PM, Bob (Robert) McMahon
> > <[email protected]> wrote:
> >>
> >> It's hard to say without a lot more information (and difficult to debug
> >> via email.) Do you see the same phenomena when using UDP packets?
> >>
> >>
> >>
> >> If it's TCP only a next step may be to analyze the tcp flows with
> >> something like tcp trace. http://www.tcptrace.org/
> >>
> >>
> >>
> >> Bob
> >>
> >> From: Varun Sharma [mailto:[email protected]]
> >> Sent: Thursday, February 20, 2014 1:45 AM
> >> To: Bob (Robert) McMahon
> >> Cc: [email protected]; [email protected]
> >> Subject: Re: [Iperf-users] Fwd: Sending rate decrease in TCP
> bidirectional
> >> test .
> >>
> >>
> >>
> >>
> >>
> >> Hi Bob
> >>
> >> Thanks for reply.
> >>
> >> I change in iperf as you suggested , but problem still occur. Is there
> any
> >> another setting for overcome this problem ?
> >>
> >> can you tell me why this happen ?
> >>
> >>
> >>
> >> Varun
> >>
> >>
> >>
> >> On Thu, Feb 20, 2014 at 11:11 AM, Bob (Robert) McMahon
> >> <[email protected]> wrote:
> >>
> >> I've had to increase the NUM_REPORT_STRUCTS to get better iperf
> >> performance in 2.0.5
> >>
> >>
> >>
> >> improved/iperf] $ svn diff include/*.h
> >>
> >> Index: include/Reporter.h
> >>
> >> ===================================================================
> >>
> >> --- include/Reporter.h (revision 2)
> >>
> >> +++ include/Reporter.h (working copy)
> >>
> >> @@ -61,7 +61,7 @@
> >>
> >>
> >>
> >> #include "Settings.hpp"
> >>
> >>
> >>
> >> -#define NUM_REPORT_STRUCTS 700
> >>
> >> +#define NUM_REPORT_STRUCTS 7000
> >>
> >> #define NUM_MULTI_SLOTS 5
> >>
> >>
> >>
> >> Bob
> >>
> >>
> >>
> >> From: Varun Sharma [mailto:[email protected]]
> >> Sent: Wednesday, February 19, 2014 9:15 PM
> >> To: [email protected]; [email protected]
> >> Subject: [Iperf-users] Fwd: Sending rate decrease in TCP bidirectional
> >> test .
> >>
> >>
> >>
> >> Hi,
> >>
> >> My machine ethtool -i info.
> >>
> >> driver: mlx4_en
> >>
> >> version: 2.1.6 (Aug 27 2013)
> >> firmware-version: 2.5.0
> >> bus-info: 0000:19:00.0
> >>
> >> Even after applying patch problem still occur. Can you tell me the
> reason
> >> for this why decrease in Sending side happen ?
> >> Is this problem regarding iperf or TCP/IP stack or nic card ?
> >>
> >> Regards
> >>
> >> Varun Sharma
> >>
> >>
> >>
> >>
> >>
> >> ---------- Forwarded message ----------
> >> From: Amir Ancel <[email protected]>
> >> Date: Wed, Feb 19, 2014 at 2:36 PM
> >> Subject: RE: [Iperf-users] Sending rate decrease in TCP bidirectional
> test
> >> .
> >> To: Varun Sharma <[email protected]>, "[email protected]
> "
> >> <[email protected]>
> >> Cc: Sagi Schlanger <[email protected]>
> >>
> >> Hi Varun,
> >>
> >>
> >>
> >> Can you please share your driver and firmware versions using "ethtool -i
> >> ethX" ?
> >>
> >> Also, attached a patch that fixes bidirectional functional issue.
> >>
> >>
> >>
> >> Thanks,
> >>
> >>
> >>
> >> Amir Ancel
> >>
> >> Performance and Power Group Manager
> >>
> >> www.mellanox.com
> >>
> >>
> >>
> >> From: Varun Sharma [mailto:[email protected]]
> >> Sent: Wednesday, February 19, 2014 10:44 AM
> >> To: [email protected]
> >> Subject: [Iperf-users] Sending rate decrease in TCP bidirectional test .
> >>
> >>
> >>
> >> Hi,
> >>
> >> I am using iperf v 2.0.5 for testing the Mellanox ConnectX VPI card.
> Its a
> >> dual port 10G card. Two 16 core machines with 64GB RAM are connected
> back to
> >> back.
> >>
> >> In TCP Bidirectional test case sending throughput decrease as compare to
> >> TCP Unidirectional test case sending .
> >>
> >> All cases use default setting . No extra parameter is set.
> >>
> >>
> >>
> >> In case of 4 Client threads Output comes :--
> >>
> >> Unidirectional Send Process --- 9.6 Gbps
> >>
> >> Bidirectional Send Process ---- 4.9 Gbps
> >>
> >>
> >> In case of 8 Client threads Output comes :--
> >>
> >> Unidirectional Send Process --- 9.7 Gbps
> >>
> >> Bidirectional Send Process -- 6.4 Gbps
> >>
> >>
> >> In case of 16 Client threads Output comes :--
> >>
> >> Unidirectional Send Process --- 9.7 Gbps
> >>
> >> Bidirectional Send Process -- 8 Gbps
> >>
> >> Any reason for this outcome ?
> >>
> >> Regards
> >>
> >> Varun
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
> >
> >
> ------------------------------------------------------------------------------
> > Managing the Performance of Cloud-Based Applications
> > Take advantage of what the Cloud has to offer - Avoid Common Pitfalls.
> > Read the Whitepaper.
> >
> http://pubads.g.doubleclick.net/gampad/clk?id=121054471&iu=/4140/ostg.clktrk
> > _______________________________________________
> > Iperf-users mailing list
> > [email protected]
> > https://lists.sourceforge.net/lists/listinfo/iperf-users
> >
>
------------------------------------------------------------------------------
Learn Graph Databases - Download FREE O'Reilly Book
"Graph Databases" is the definitive new guide to graph databases and their
applications. Written by three acclaimed leaders in the field,
this first edition is now available. Download your free book today!
http://p.sf.net/sfu/13534_NeoTech
_______________________________________________
Iperf-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/iperf-users
