Re: [Iperf-users] Fwd: Sending rate decrease in TCP bidirectional test .

[Varun S. <vs...@gm...>]

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 <
rmc...@br...> 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:vs...@gm...]
> *Sent:* Wednesday, February 19, 2014 9:15 PM
> *To:* ipe...@li...; am...@me...
> *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* <am...@me...>
> Date: Wed, Feb 19, 2014 at 2:36 PM
> Subject: RE: [Iperf-users] Sending rate decrease in TCP bidirectional test
> .
> To: Varun Sharma <vs...@gm...>, "ipe...@li..." <
> ipe...@li...>
> Cc: Sagi Schlanger <sa...@me...>
>
>   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:vs...@gm...]
> *Sent:* Wednesday, February 19, 2014 10:44 AM
> *To:* ipe...@li...
> *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
>
>
>
>
>