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  1. 10 12月, 2016 7 次提交
    • E
      udp: udp_rmem_release() should touch sk_rmem_alloc later · 02ab0d13
      由 Eric Dumazet 提交于 
      In flood situations, keeping sk_rmem_alloc at a high value
prevents producers from touching the socket.

It makes sense to lower sk_rmem_alloc only at the end
of udp_rmem_release() after the thread draining receive
queue in udp_recvmsg() finished the writes to sk_forward_alloc.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      02ab0d13
    • E
      udp: add batching to udp_rmem_release() · 6b229cf7
      由 Eric Dumazet 提交于 
      If udp_recvmsg() constantly releases sk_rmem_alloc
for every read packet, it gives opportunity for
producers to immediately grab spinlocks and desperatly
try adding another packet, causing false sharing.

We can add a simple heuristic to give the signal
by batches of ~25 % of the queue capacity.

This patch considerably increases performance under
flood by about 50 %, since the thread draining the queue
is no longer slowed by false sharing.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      6b229cf7
    • E
      udp: copy skb->truesize in the first cache line · c84d9490
      由 Eric Dumazet 提交于 
      In UDP RX handler, we currently clear skb->dev before skb
is added to receive queue, because device pointer is no longer
available once we exit from RCU section.

Since this first cache line is always hot, lets reuse this space
to store skb->truesize and thus avoid a cache line miss at
udp_recvmsg()/udp_skb_destructor time while receive queue
spinlock is held.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      c84d9490
    • E
      udp: add busylocks in RX path · 4b272750
      由 Eric Dumazet 提交于 
      Idea of busylocks is to let producers grab an extra spinlock
to relieve pressure on the receive_queue spinlock shared by consumer.

This behavior is requested only once socket receive queue is above
half occupancy.

Under flood, this means that only one producer can be in line
trying to acquire the receive_queue spinlock.

These busylock can be allocated on a per cpu manner, instead of a
per socket one (that would consume a cache line per socket)

This patch considerably improves UDP behavior under stress,
depending on number of NIC RX queues and/or RPS spread.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      4b272750
    • D
      Merge branch 'qcom-emac' · d96dac14
      由 David S. Miller 提交于 
      Timur Tabi says:

====================
net: qcom/emac: simplify support for different SOCs

On SOCs that have the Qualcomm EMAC network controller, the internal
PHY block is always different.  Sometimes the differences are small,
sometimes it might be a completely different IP.  Either way, using version
numbers to differentiate them and putting all of the init code in one
file does not scale.

This patchset does two things:  The first breaks up the current code into
different files, and the second patch adds support for a third SOC, the
Qualcomm Technologies QDF2400 ARM Server SOC.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      d96dac14
    • T
      net: qcom/emac: add support for the Qualcomm Technologies QDF2400 · a51f4047
      由 Timur Tabi 提交于 
      The QDF2432 and the QDF2400 have slightly different internal PHYs,
so there are some programming differences.  Some of the registers in
the QDF2400 have moved, and some registers require different values
during initialization.

Because of the differences, and because HIDs are a scare resource,
the ACPI tables specify the hardware version in an _HRV property.
Version 1 is the QDF2432, and version 2 is the QDF2400.  Any future
SOC that has the same internal PHY but different programming
requirements will be assigned the next available version number.
Signed-off-by: NTimur Tabi <timur@codeaurora.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      a51f4047
    • T
      net: qcom/emac: move phy init code to separate files · 1e88ab6f
      由 Timur Tabi 提交于 
      The internal PHY of the EMAC differs on each SOC, and the list will
only continue to grow.  By separating the code into individual files,
we can add support for more SOCs more cleanly.

Note: The internal PHY is also sometimes called the SGMII device.

We also stop referring to the various PHY variations by version number,
so no more "v2", "v3", etc.  Instead, the devices are named after the
SOC they are, which is in sync with the device tree property names.

Future patches will probably rearrange more code among the files.
Signed-off-by: NTimur Tabi <timur@codeaurora.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      1e88ab6f
  3. 09 12月, 2016 33 次提交