<div dir="ltr">TCP. And yes, Windblows makes a totally shitty NFS product. It matches most everything else they make (Excel is a noted exception).<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Apr 10, 2013 at 11:05 AM, Derek Atkins <span dir="ltr"><<a href="mailto:warlord@mit.edu" target="_blank">warlord@mit.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Jim,<br>
<div class="im"><br>
Jim Kinney <<a href="mailto:jim.kinney@gmail.com">jim.kinney@gmail.com</a>> writes:<br>
<br>
> so what happens when a series of machines, each with 1G nic all try to read/<br>
> write to the same NFS mount filesystem, also on a single 1G nic, and this goes<br>
> on for hours at a time?<br>
><br>
> Eventually, nic buffers fill and the OS is told to "hold that thought". But<br>
> for how long? Will the OS continue to try the write until it succeeds? Or will<br>
> the constant buffer overload just cause a nic to flush the buffer and hope for<br>
> better luck next send?<br>
<br>
</div>Are you using UDP or TCP?<br>
<br>
If you're doing TCP then you just have to worry about buffer bloat.<br>
Beyond that, TCP will handle congestion control and should effectively<br>
rate-limit all clients.<br>
<br>
Using UDP, however, it's all a question of NFS's built-in congestion<br>
control. This would depend on the version of the client and server.<br>
<br>
If your server is Windows, then I think you're probably screwed. Their<br>
NFS server implementation has never been good.<br>
<span class="HOEnZb"><font color="#888888"><br>
-derek<br>
--<br>
Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory<br>
Member, MIT Student Information Processing Board (SIPB)<br>
URL: <a href="http://web.mit.edu/warlord/" target="_blank">http://web.mit.edu/warlord/</a> PP-ASEL-IA N1NWH<br>
<a href="mailto:warlord@MIT.EDU">warlord@MIT.EDU</a> PGP key available<br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>-- <br>James P. Kinney III<br><i><i><i><i><br></i></i></i></i>Every time you stop a school, you will have to build a jail. What you
gain at one end you lose at the other. It's like feeding a dog on his
own tail. It won't fatten the dog.<br>
- Speech 11/23/1900 Mark Twain<br><i><i><i><i><br><a href="http://electjimkinney.org" target="_blank">http://electjimkinney.org</a><br><a href="http://heretothereideas.blogspot.com/" target="_blank">http://heretothereideas.blogspot.com/</a><br>
</i></i></i></i>
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