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vhost: fix long stall of negotiation

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Setting up the mapping from GPA (guest physical address) to HPA (guest
physical address) could be very time consuming when the guest memory is
backened with small pages (4K). The bigger the guest memory, the longer
it takes. This could lead a very long vhost-user negotiation.

Since the mapping is only needed in zero copy mode so far, we could
avoid such time consuming settup when zero copy is turned off (which is
the default case).

It's actually a workaround, a right fix might be to start a new thread,
and hide the big latency there.

Fixes: e246896178e6 ("vhost: get guest/host physical address mappings")
Cc: stable@dpdk.org

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
This commit is contained in:
Yuanhan Liu 2017-01-22 16:46:59 +08:00
parent cc7301908c
commit b8b992e93f
1 changed files with 2 additions and 1 deletions
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3
lib/librte_vhost/vhost_user.c
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@ -567,7 +567,8 @@ vhost_user_set_mem_table(struct virtio_net *dev, struct VhostUserMsg *pmsg)
reg->host_user_addr = (uint64_t)(uintptr_t)mmap_addr +
mmap_offset;
add_guest_pages(dev, reg, alignment);
if (dev->dequeue_zero_copy)
add_guest_pages(dev, reg, alignment);
RTE_LOG(INFO, VHOST_CONFIG,
"guest memory region %u, size: 0x%" PRIx64 "\n"