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<DIV>Since you are running on vmware, you can optimize your disk IO by setting elevator=noop ( google it).</DIV>
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<DIV>IMO, Zendto won't get a big benefit by using the elevator setting, but our other disk IO intensive systems showed a marked increase in IOP performance (about 30% as measured by NetAPP Balance). Most, if not all linux systems use cfq. What happens is that a disk io is requested, cfq queues the request and hands it to the vmware abstraction layer and then the IO request is handed to the NetApp which re-queues the request.</DIV>
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<DIV>We're running elevator=noop in grub's menu.lst on Redhat v5 & 6 , SLES v10 & 11 and CentOS v5 & 6 (32 and 64 bit) systems on Vmware Esxi systems.</DIV>
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<DIV>Enjoy</DIV>
<DIV>Brad</DIV>
<DIV><BR><BR>>>> On 7/15/2013 at 11:08 AM, John Thurston <john.thurston@alaska.gov> wrote:<BR></DIV>
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<DIV style="BORDER-LEFT: #050505 1px solid; PADDING-LEFT: 7px">On 7/13/2013 8:21 AM, Gray McCord wrote:<BR>> Thanks, John! I'll give this a try. BTW, when you talk about less<BR>> throughput, can you tell about how much?<BR><BR>I did not perform benchmarks in either configuration. But based on my <BR>personal observations it is no more than half the throughput. Note, this <BR>isn't responsiveness or latency I'm discussing, this is time required to <BR>transfer a large file.<BR><BR>If this were a mission-critical application, I don't think I'd deploy it <BR>this way. Since this is a kinda-best-effort application for us, the <BR>throughput isn't the deciding factor. I hope, someday, to move the <BR>application behind a NetScaler and retire my apache proxy.<BR><BR>YMMV. In my deployment, I'm proxying https via https, so there is a lot <BR>of protocol overhead. I am not using "jumbo" frames. I have made no <BR>effort to optimize my https cipher negotiations or implement ssl <BR>off-loading. My ZendTo is running on linux on VMWare ESXi. I don't know <BR>if VMWare or its networking is is optimally configured.<BR>-- <BR> Do things because you should, not just because you can.<BR><BR>John Thurston 907-465-8591<BR>John.Thurston@alaska.gov<BR>Enterprise Technology Services<BR>Department of Administration<BR>State of Alaska<BR>_______________________________________________<BR>ZendTo mailing list<BR>ZendTo@zend.to<BR><A href="http://mailman.ecs.soton.ac.uk/mailman/listinfo/zendto">http://mailman.ecs.soton.ac.uk/mailman/listinfo/zendto</A><BR></DIV></TD></TR></TBODY></TABLE></BODY></HTML>