>From: Maxime Coquelin [mailto:[email protected]] >Sent: Tuesday, November 7, 2017 5:18 PM >To: Kavanagh, Mark B <[email protected]>; [email protected] >Cc: Loftus, Ciara <[email protected]>; [email protected] >Subject: Re: [ovs-dev][RFC PATCH 2/2] netdev-dpdk: add support for vhost IOMMU >feature > >Hi Mark, > >Thanks for the patch, it looks overall good to me once Ciara comments >taken into account. > >I would just add to below note: > >On 11/07/2017 04:59 PM, Mark Kavanagh wrote: >> +.. important:: >> + >> + Enabling the IOMMU feature also enables the vhost user reply-ack >protocol; >> + this is known to work on QEMU v2.10.0, but is buggy on older versions >> + (2.7.0 - 2.9.0, inclusive). Consequently, the IOMMU feaure is disabled >by >> + default (and should remain so if using the aforementioned versions of >QEMU) > >"Starting Qemu v2.9.1, vhost-iommu-support can safely be enabled, even >without having an IOMMU device with no performance penalty."
Hey Maxime, Thanks for the quick feedback - I'll roll the suggestions from both yourself and Ciara into the non-RFC version of the patch, once DPDK v17.11 is released (which should be in the next week or so). All the best, Mark > >Cheers, >Maxime _______________________________________________ dev mailing list [email protected] https://mail.openvswitch.org/mailman/listinfo/ovs-dev
