Solarflare SFA6902F, User Manual, Page: 336 / 375

Issue 11 © Solarflare Communications 2014 331
Solarflare Server Adapter
User Guide
HKLM\SYSTEM\CurrentControlSet\services\XNAP\Parameters\
3 Create any of the following registry values under the
XNAP\Parameters key
.
irq_usecs REG_DWORD <value>
rx_ring REG_DWORD <value>
4 Reboot the VM.
Linux Guests
1 Edit
/etc/modprobe.conf
, inserting the following entry:
options xnap rx_irq_mod_usec=<value> rx_ring=<value>
2 Reload the xnap driver:
# modprobe -r xnap
# modprobe xnap
Performance Results
• Equipment Configuration
Performance tests were conducted between two (back to back) Dell PowerEdge C6100: 4 x Xeon
X5600, 48G RAM.
• Host
Host Virtualization plan used was XenServer6.
• Guest
A number of guest VMs running Windows Server 2008 R2 (64bit) were started on each server. The
benchmarking tool used was IXIA Chariot (HighPerf test script) for measure bandwidth.
Windows Guest Bandwidth
Table 86 identifies bandwidth figures recorded for 5 TCP streams per port, per direction, between
each pair of VMs on the two servers (message size of 65535 bytes, each VM was configured with 4
vCPUs).
Table 86: Windows Guest Bandwidth
Number of
10G ports
Traffic
Number
of VMs Baseline (no
SR-IOV) Accelerated
(SR-IOV plug-in)
1 Unidirectional 1 1.66 Gbps 3.49 Gbps
1 Bidirectional 1 2.52 Gbps 3.88 Gbps
2 Bidirectional 1 2.71 Gbps 4.20 Gbps
1 Unidirectional 4 4.85 Gbps 9.39 Gbps
1 Bidirectional 4 5.99 Gbps 17.9 Gbps