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List:       openssl-users
Subject:    [openssl-users] Openssl
From:       Lasse Thorbro-Steenberg <lthorbrosteenberg () gmail ! com>
Date:       2017-04-19 14:39:51
Message-ID: CAJSbJ=QtnX839iC1OdfySWm9VHCJesryzpK5h-5rQ2Yg5A_TuQ () mail ! gmail ! com
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Hi,

New to this list!

I am using Openssl in a project that send large amounts of data in bursts
from a windows 2008 server to an Ubuntu 16.04 client.
It works well with low data rates (<1mbs) but when mean data rates hits
around 2 mbs, things get ugly. I use blocking wrtite calls and my buffers
overflow after a while at 2mbs.
Using Wireshark I can see the TCP window remains open, but after a few
seconds on 2mbs the server start fragmenting IP packets which completely
drops the throughput to around 1 mbs.
Data is delivered successfully even with fragmentation, but the effective
throughput achievable on the link drops significantly.

Has anyone seen this type of issue before ?

Thanks,
Lasse

[Attachment #5 (text/html)]

<div dir="ltr"><div><div><div><div><div>Hi,<br><br></div>New to this \
list!<br><br></div>I am using Openssl in a project that send large amounts of data in \
bursts from a windows 2008 server to an Ubuntu 16.04 client. <br></div>It works well \
with low data rates (&lt;1mbs) but when mean data rates hits around 2 mbs, things get \
ugly. I use blocking wrtite calls and my buffers overflow after a while at 2mbs. \
<br></div>Using Wireshark I can see the TCP window remains open, but after a few \
seconds on 2mbs the server start fragmenting IP packets which completely drops the \
throughput to around 1 mbs. <br></div>Data is delivered successfully even with \
fragmentation, but the effective throughput achievable on the link drops \
significantly. <br><div><br></div><div>Has anyone seen this type of issue before ? \
<br><br></div><div>Thanks,<br></div><div>Lasse<br></div></div>



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