On Wed, Dec 06, 2017 at 12:23:19PM +0100, Maxime Coquelin wrote: > Hi, > > On 12/05/2017 07:58 AM, Wang, Wei 5. (NSB - CN/Hangzhou) wrote: > > > > > >Hi, all > > > >In DPDK document, it it described that Virtio in containers Cannot work when > >there are more than VHOST_MEMORY_MAX_NREGIONS(8) hugepages. In another word, > >do not use 2MB hugepage so far. Do you know the reason of this limitation? > > What document are you referring to? > Actually, a single region is composed of several hugepages, be it 1G or > 2M. I use 2M hugepages daily without issues.
He was talking about virtio-user. --yliu > > The limitation comes from the Vhost-user protocol spec. I know there are > discussions to enlarge it, but it would require a new protocol flag not > to break existing implementations, so no workaround possible. > > >In my envirionment, the pdpe1gb is not set in cpu flag, so hugepage can't be > >set to 1GB size. The hugepage number shall be more than 8 > > > > > >So is there any solution or workaround to fix this limitation? Or change > >dpdk code to fix this limitation? > > Have you tried to use 2MB pages and faced the NREGIONS > 8 case? > If so, could you tell us more about your setup (QEMU version, VM RAM > size, etc...)? > > Cheers, > Maxime > > > > > >Vivian > >seat: 19009 > >phone: 13738006921 > > > > > >