This section describes previously known issues that have been resolved since release version 1.2.
+Running TestPMD with SRIOV in Domain U may cause it to hang when XENVIRT switch is on
+-------------------------------------------------------------------------------------
+
++--------------------------------+--------------------------------------------------------------------------------------+
+| Title | Running TestPMD with SRIOV in Domain U may cause it to hang when XENVIRT switch is on|
+| | |
++================================+======================================================================================+
+| Reference # | IXA00168949 |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Description | When TestPMD is run with only SRIOV port /testpmd -c f -n 4 -- -i, the following |
+| | error occurs: |
+| | |
+| | PMD: gntalloc: ioctl error |
+| | |
+| | EAL: Error - exiting with code: 1 |
+| | |
+| | Cause: Creation of mbuf pool for socket 0 failed |
+| | |
+| | Then, alternately run SRIOV port and virtIO with testpmd: |
+| | |
+| | testpmd -c f -n 4 -- -i |
+| | |
+| | testpmd -c f -n 4 --use-dev="eth_xenvirt0" -- -i |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Implication | DomU will not be accessible after you repeat this action some times |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Resolution/ Workaround | Run testpmd with a "--total-num-mbufs=N(N<=3500)" |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Affected Environment/ Platform | Fedora 16, 64 bits + Xen hypervisor 4.2.3 + Domain 0 kernel 3.10.0 |
+| | +Domain U kernel 3.6.11 |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Driver/Module | TestPMD Sample Application |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+
+Vhost-xen cannot detect Domain U application exit on Xen version 4.0.1
+----------------------------------------------------------------------
+
++--------------------------------+--------------------------------------------------------------------------------------+
+| Title | Vhost-xen cannot detect Domain U application exit on Xen 4.0.1. |
+| | |
++================================+======================================================================================+
+| Reference # | IXA00168947 |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Description | When using DPDK applications on Xen 4.0.1, e.g. TestPMD Sample Application, |
+| | on killing the application (e.g. killall testmd) vhost-switch cannot detect |
+| | the domain U exited and does not free the Virtio device. |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Implication | Virtio device not freed after application is killed when using vhost-switch on Xen |
+| | 4.0.1 |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Resolution | Resolved in DPDK 1.8 |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Affected Environment/ Platform | Xen 4.0.1 |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Driver/Module | Vhost-switch |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+
+Virtio incorrect header length used if MSI-X is disabled by kernel driver
+-------------------------------------------------------------------------
+
++--------------------------------+--------------------------------------------------------------------------------------+
+| Title | Virtio incorrect header length used if MSI-X is disabled by kernel driver or |
+| | if VIRTIO_NET_F_MAC is not negotiated. |
+| | |
++================================+======================================================================================+
+| Reference # | IXA00384256 |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Description | The Virtio header for host-guest communication is of variable length and |
+| | is dependent on whether MSI-X has been enabled by the kernel driver for the network |
+| | device. |
+| | |
+| | The base header length of 20 bytes will be extended by 4 bytes to accommodate MSI-X |
+| | vectors and the Virtio Network Device header will appear at byte offset 24. |
+| | |
+| | The Userspace Virtio Poll Mode Driver tests the guest feature bits for the presence |
+| | of VIRTIO_PCI_FLAG_MISIX, however this bit field is not part of the Virtio |
+| | specification and resolves to the VIRTIO_NET_F_MAC feature instead. |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Implication | The DPDK kernel driver will enable MSI-X by default, |
+| | however if loaded with "intr_mode=legacy" on a guest with a Virtio Network Device, |
+| | a KVM-Qemu guest may crash with the following error: "virtio-net header not in first |
+| | element". |
+| | |
+| | If VIRTIO_NET_F_MAC feature has not been negotiated, then the Userspace Poll Mode |
+| | Driver will assume that MSI-X has been disabled and will prevent the proper |
+| | functioning of the driver. |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Resolution | Ensure #define VIRTIO_PCI_CONFIG(hw) returns the correct offset (20 or 24 bytes) for |
+| | the devices where in rare cases MSI-X is disabled or VIRTIO_NET_F_MAC has not been |
+| | negotiated. |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Affected Environment/ Platform | Virtio devices where MSI-X is disabled or VIRTIO_NET_F_MAC feature has not been |
+| | negotiated. |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Driver/Module | librte_pmd_virtio |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+
+Unstable system performance across application executions with 2MB pages
+------------------------------------------------------------------------
+
++--------------------------------+--------------------------------------------------------------------------------------+
+| Title | Unstable system performance across application executions with 2MB pages |
+| | |
++================================+======================================================================================+
+| Reference # | IXA00372346 |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Description | The performance of an DPDK application may vary across executions of an |
+| | application due to a varying number of TLB misses depending on the location of |
+| | accessed structures in memory. |
+| | This situation occurs on rare occasions. |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Implication | Occasionally, relatively poor performance of DPDK applications is encountered. |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Resolution/ Workaround | Using 1 GB pages results in lower usage of TLB entries, resolving this issue. |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Affected Environment/ Platform | Systems using 2 MB pages |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Driver/Module | All |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+
+Link status change not working with MSI interrupts
+--------------------------------------------------
+
++--------------------------------+--------------------------------------------------------------------------------------+
+| Title | Link status change not working with MSI interrupts |
+| | |
++================================+======================================================================================+
+| Reference # | IXA00378191 |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Description | MSI interrupts are not supported by the PMD. |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Implication | Link status change will only work with legacy or MSI-X interrupts. |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Resolution/ Workaround | The igb_uio driver can now be loaded with either legacy or MSI-X interrupt support. |
+| | However, this configuration is not tested. |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Affected Environment/ Platform | All |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+| Driver/Module | Poll Mode Driver (PMD) |
+| | |
++--------------------------------+--------------------------------------------------------------------------------------+
+
KNI does not provide Ethtool support for all NICs supported by the Poll-Mode Drivers
------------------------------------------------------------------------------------
| Driver/Module | Poll mode drivers |
| | |
+---------------------------------+---------------------------------------------------------------------------------------+
+
+
+
+Double VLAN does not work on Intel® 40GbE ethernet contoller
+------------------------------------------------------------
+
++---------------------------------+---------------------------------------------------------------------------------------+
+| Title | Double VLAN does not work on Intel® 40GbE ethernet controller |
+| | |
++=================================+=======================================================================================+
+| Reference # | IXA00369908 |
+| | |
++---------------------------------+---------------------------------------------------------------------------------------+
+| Description | On Intel® 40 GbE ethernet controller double VLAN does not work. |
+| | This was confirmed as a Firmware issue which will be fixed in later versions of |
+| | firmware. |
++---------------------------------+---------------------------------------------------------------------------------------+
+| Implication | After setting double vlan to be enabled on a port, no packets can be transmitted out |
+| | on that port. |
++---------------------------------+---------------------------------------------------------------------------------------+
+| Resolution/Workaround | Resolved in latest release with firmware upgrade. |
+| | |
+| | |
++---------------------------------+---------------------------------------------------------------------------------------+
+| Affected Environment/Platform | All |
+| | |
++---------------------------------+---------------------------------------------------------------------------------------+
+| Driver/Module | Poll mode drivers |
+| | |
++---------------------------------+---------------------------------------------------------------------------------------+
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