On 09/08/2011 04:36 PM, Mike Christie wrote:
> On 09/08/2011 02:06 AM, Heinrich Langos wrote:
>> Hi htere,
>>
>> I am using the open-iscsi initiator to access a storage back end for
>> my Xen based virtualization infrastructure.
>> Since The current 3.0.x Linux kernel finally has everything that I
>> need to run the host system (Dom0) without any additional patches I
>> thought I'd give it a try and see if I can replace the 2.6.32 hosts
>> that cause a lot of trouble when mixing Xen + iSCSI + multipath.
>>
>> This is raw "dd" throughput for reading ~30GB from an iSCSI storage
>> via a dedicated 1GB Ethernet link.
>>
>> 2.6.32 : 102 MB/s
>> 2.6.38 : 100 MB/s
>> 2.6.39 : 44 MB/s
>> 3.0.1 : 43 MB/s
>>
> 
> I can replicate this now. For some reason I only see it with 1 gig. I
> think my 10 gig setups that I have been testing with are limited by
> something else.
> 
> Doing git bisect now to track down the change that caused the problem.
> 

I did not find anything really major in the iscsi code. But I did notice
that if I just disable iptables throughput goes from about 5 MB/s back
up to 85 MB/s.

If you disable iptables do you see something similar.

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