On 09/15/2011 05:26 AM, Heinrich Langos wrote: > Hi Mike, > > On Thu, Sep 08, 2011 at 09:25:29PM -0500, Mike Christie wrote: >> On 09/08/2011 09:23 PM, Mike Christie wrote: >>> On 09/08/2011 04:36 PM, Mike Christie wrote: >>>> On 09/08/2011 02:06 AM, Heinrich Langos wrote: >>>>> >>>>> 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. >>> >> >> I also noticed that in 2.6.38 throughput would almost immediately start >> at 80-90 MB/s, but with 2.6.39 it takes a while (maybe 10 seconds >> sometimes) to ramp up. > > Did you find the reason of the performance drop? Is there anything I can do > to help? I'll have to get that new box into production soon and since I am
Did you confirm that stopping iptables also solves the problem for you? Was waiting to hear back from you to make sure we are working on the same bug. -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To post to this group, send email to open-iscsi@googlegroups.com. To unsubscribe from this group, send email to open-iscsi+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/open-iscsi?hl=en.
