diff options
| author |   Shesha Sreenivasamurthy <shesha@cisco.com> | 2016-04-29 01:32:42 -0400 |
|---|---|---|
| committer |   Damjan Marion <damarion@cisco.com> | 2016-04-29 12:44:12 +0000 |
| commit | 6caec3d8b42fa22938ea0aa9d8ec0db54c75ea1e (patch) | |
| tree | 45240d8d7b33bbfd5d12e38116e7eef488e7ccda | |
| parent | daf141946d7f1a053ad1590a86d7ec4cb365e43b (diff) | |
Improve performance of dpdk-vhost driver
By setting the flag in used table, guest is
prevented from kicking the host when it adds
buffers. This results in 100% performance improvement
when tested throughput using iperf3.
Change-Id: Iefaf5b97d1444c216bb373998732a437d333d521
Signed-off-by: Shesha Sreenivasamurthy <shesha@cisco.com>
| -rw-r--r-- | vnet/vnet/devices/dpdk/vhost_user.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/vnet/vnet/devices/dpdk/vhost_user.c b/vnet/vnet/devices/dpdk/vhost_user.c index 2ebf48a5..c82b37f9 100644 --- a/vnet/vnet/devices/dpdk/vhost_user.c +++ b/vnet/vnet/devices/dpdk/vhost_user.c @@ -589,6 +589,15 @@ dpdk_vhost_user_set_vring_addr(u32 hw_if_index, u8 idx, u64 desc, \ clib_warning("falied to set vring addr"); } + /* + * Inform the guest that there is no need to inform (kick) the + * host when it adds buffers. kick results in vmexit and will + * incur performance degradation. + * + * The below function sets a flag in used table. Therefore, + * should be initialized after initializing vq->used. + */ + rte_vhost_enable_guest_notification(&xd->vu_vhost_dev, idx, 0); stop_processing_packets(hw_if_index, idx); return 0; |