On 11/20/2012 02:56 PM, Ben Greear wrote: > We are trying out some new hardware, but it's not able to go above about > 4Gbps in each direction > (using modified pktgen). The two ixgbe ports are cabled to each other. > > Ethernet controller: > > 03:00.0 Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+ > Network Connection (rev 01) > 03:00.1 Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+ > Network Connection (rev 01) > > CPU: > > Intel(R) Xeon(R) CPU E5-2643 0 @ 3.30GHz > > dmesg shows it is using 5GT/s: > > ixgbe 0000:03:00.0: (PCI Express:5.0GT/s:Width x8) 00:e0:ed:1e:d4:dc > > > On similar setup (and same kernel) with i7 or e3 processor systems it runs > right at 10Gbps bi-directional. > > Is the E5-2643 just not that fast of a processor, or should I expect > better performance? > > Thanks, > Ben >
What is the driver and kernel you are testing this with? Also, have you checked to make sure the feature set is comparable? For instance the E5 can support VT-d. If that is enabled it can have a negative impact on I/O performance due to extra locking overhead for map/unmap calls on the host. Assuming you are running a recent kernel with support for the "perf" command you might do a quick "perf top" while running your test to see what pops up as consuming most of your CPU time. Thanks, Alex ------------------------------------------------------------------------------ Monitor your physical, virtual and cloud infrastructure from a single web console. Get in-depth insight into apps, servers, databases, vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial. Pricing starts from $795 for 25 servers or applications! http://p.sf.net/sfu/zoho_dev2dev_nov _______________________________________________ E1000-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
