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Xenserver 6.0 on Dell 710 servers with broadcom BCM5709 - very slow network

Posted on 2011-11-01
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Last Modified: 2012-05-12
Hi,

I have 2 Dell 710 servers, both running Xenserver 6.0 and both exhibiting extremely slow network throughput.

I have followed a plethora of guides, but they mostly relate to virtual driver settings on Win2k3.

Currently I peak around 1Mbps from a guest to machine external to the host.
Between guests on the same host I get around 800Mbps.

This makes me think it's a physical NIC driver issue on the Host.

The same slowness is evident with connection via DELL gigabit switch, Cisco gigabit switch and even through a 100Mbps Sonicwall port.  Throughput rarely exceeds 1Mbps and if it does, it is by a pitiful amount.

I'm pretty much at my wits end and am contemplating a long weekend to switch everything over to VMWare.
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Question by:Zach2001
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LVL 124
ID: 37061895
do you experience any network issues or errors on the physical switch ports?
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Author Comment

by:Zach2001
ID: 37061945
Hi, not directly on the ports involved - there were a few CRC errors on some other ports though - nothing I would take as serious.  Nothing serious enough to cause link retrains.

On closer inpection it would appear that perhaps all the slowness is actually when via the DELL 5548 - there seems to have been some confusion over the overnight test procedure to try the other switches.

A reboot of the switch fixes the issue for a short period.  2-24 hours.
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Expert Comment

by:GrappaLux
ID: 37119127
same problem here. XenServer 6 on R810 in pre-production and we discovered the network bottleneck loading the hosted XenApp with real users. network speed is around 12Mb/s externally but it reach 250Mb/s with machines in same host.
all last week I've read tons of posts with similar problems but mainly on W2K3 and we are on W2K8R2 and I've tried all the TeaskOffLoad tricks both on VIF and PIF but no improvements.
actually I've moved everything on VMware and looking for a fix before vene formatting XenServer
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Author Comment

by:Zach2001
ID: 37119133
What switch(s) you using ?
We have just finished an identical build for another SMB client but hosted on VMWare essentials Plus 4.1 with identical hardware and so far everything is peachy
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Expert Comment

by:GrappaLux
ID: 37158542
Cisco catalyst 6509

removed all vlan and enabled just one nic
formatted the machine and installed win2008, network speed is normal
re-formatted and installed xs6.0 and a win2008 vm, performance are dropping down again
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Expert Comment

by:GrappaLux
ID: 37158551
Furthermore Citrix reccommend a driver that is not public and the request money for having it
http://support.citrix.com/article/CTX127395
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by:Zach2001
ID: 37292400
We;ve decided to rebuild the environment with VMWare.
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LVL 124
ID: 37292413
Thanks for the update!
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Accepted Solution

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Zach2001 earned 0 total points
ID: 37351408
Since P2V converting the Xenserver guests to VMware and rebuilding the Xenserver boxes to VMWare 5.0 we have had no issues.
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Author Closing Comment

by:Zach2001
ID: 37366497
Not quite a 'Solution' if you have paid for Xen.
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