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  1. 01 7月, 2016 1 次提交
    • J
      tun: switch to use skb array for tx · 1576d986
      由 Jason Wang 提交于 
      We used to queue tx packets in sk_receive_queue, this is less
efficient since it requires spinlocks to synchronize between producer
and consumer.

This patch tries to address this by:

- switch from sk_receive_queue to a skb_array, and resize it when
  tx_queue_len was changed.
- introduce a new proto_ops peek_len which was used for peeking the
  skb length.
- implement a tun version of peek_len for vhost_net to use and convert
  vhost_net to use peek_len if possible.

Pktgen test shows about 15.3% improvement on guest receiving pps for small
buffers:

Before: ~1300000pps
After : ~1500000pps
Signed-off-by: NJason Wang <jasowang@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      1576d986
  3. 08 6月, 2016 1 次提交
    • J
      vhost_net: stop polling socket during rx processing · 8241a1e4
      由 Jason Wang 提交于 
      We don't stop rx polling socket during rx processing, this will lead
unnecessary wakeups from under layer net devices (E.g
sock_def_readable() form tun). Rx will be slowed down in this
way. This patch avoids this by stop polling socket during rx
processing. A small drawback is that this introduces some overheads in
light load case because of the extra start/stop polling, but single
netperf TCP_RR does not notice any change. In a super heavy load case,
e.g using pktgen to inject packet to guest, we get about ~8.8%
improvement on pps:

before: ~1240000 pkt/s
after:  ~1350000 pkt/s
Signed-off-by: NJason Wang <jasowang@redhat.com>
Acked-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      8241a1e4
  5. 11 3月, 2016 1 次提交
  7. 02 3月, 2016 1 次提交
    • G
      vhost: rename vhost_init_used() · 80f7d030
      由 Greg Kurz 提交于 
      Looking at how callers use this, maybe we should just rename init_used
to vhost_vq_init_access. The _used suffix was a hint that we
access the vq used ring. But maybe what callers care about is
that it must be called after access_ok.

Also, this function manipulates the vq->is_le field which isn't related
to the vq used ring.

This patch simply renames vhost_init_used() to vhost_vq_init_access() as
suggested by Michael.

No behaviour change.
Signed-off-by: NGreg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
      80f7d030
  9. 16 9月, 2015 1 次提交
  11. 12 4月, 2015 1 次提交
  13. 03 3月, 2015 1 次提交
  15. 28 2月, 2015 2 次提交
  17. 16 2月, 2015 1 次提交
  19. 05 2月, 2015 1 次提交
  21. 04 2月, 2015 2 次提交
  23. 14 1月, 2015 1 次提交
  25. 07 1月, 2015 1 次提交
  27. 10 12月, 2014 1 次提交
    • A
      put iov_iter into msghdr · c0371da6
      由 Al Viro 提交于 
      Note that the code _using_ ->msg_iter at that point will be very
unhappy with anything other than unshifted iovec-backed iov_iter.
We still need to convert users to proper primitives.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
      c0371da6
  29. 09 12月, 2014 4 次提交
  31. 23 6月, 2014 1 次提交
  33. 09 6月, 2014 3 次提交
    • M
      vhost: move memory pointer to VQs · 47283bef
      由 Michael S. Tsirkin 提交于 
      commit 2ae76693b8bcabf370b981cd00c36cd41d33fabc
    vhost: replace rcu with mutex
replaced rcu sync for memory accesses with VQ mutex locl/unlock.
This is correct since all accesses are under VQ mutex, but incomplete:
we still do useless rcu lock/unlock operations, someone might copy this
code into some other context where this won't be right.
This use of RCU is also non standard and hard to understand.
Let's copy the pointer to each VQ structure, this way
the access rules become straight-forward, and there's
no need for RCU anymore.
Reported-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
      47283bef
    • M
      vhost: move acked_features to VQs · ea16c514
      由 Michael S. Tsirkin 提交于 
      Refactor code to make sure features are only accessed
under VQ mutex. This makes everything simpler, no need
for RCU here anymore.
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
      ea16c514
    • M
      vhost-net: extend device allocation to vmalloc · 23cc5a99
      由 Michael S. Tsirkin 提交于 
      Michael Mueller provided a patch to reduce the size of
vhost-net structure as some allocations could fail under
memory pressure/fragmentation. We are still left with
high order allocations though.

This patch is handling the problem at the core level, allowing
vhost structures to use vmalloc() if kmalloc() failed.

As vmalloc() adds overhead on a critical network path, add __GFP_REPEAT
to kzalloc() flags to do this fallback only when really needed.

People are still looking at cleaner ways to handle the problem
at the API level, probably passing in multiple iovecs.
This hack seems consistent with approaches
taken since then by drivers/vhost/scsi.c and net/core/dev.c

Based on patch by Romain Francoise.

Cc: Michael Mueller <mimu@linux.vnet.ibm.com>
Signed-off-by: NRomain Francoise <romain@orebokech.com>
Acked-by: NMichael S. Tsirkin <mst@redhat.com>
      23cc5a99
  35. 02 4月, 2014 1 次提交
  37. 29 3月, 2014 2 次提交
  39. 14 2月, 2014 2 次提交
  41. 07 12月, 2013 1 次提交
  43. 04 9月, 2013 5 次提交
  45. 11 7月, 2013 2 次提交
  47. 10 7月, 2013 1 次提交
  49. 07 7月, 2013 2 次提交