1. 30 Jul, 2013 4 commits
  2. 29 Jul, 2013 3 commits
  3. 28 Jul, 2013 24 commits
  4. 26 Jul, 2013 4 commits
  5. 25 Jul, 2013 5 commits
    • Darren Hart's avatar
      pch_gbe: Add MinnowBoard support · f1a26fdf
      Darren Hart authored
      The MinnowBoard uses an AR803x PHY with the PCH GBE which requires
      special handling. Use the MinnowBoard PCI Subsystem ID to detect this
      and add a pci_device_id.driver_data structure and functions to handle
      platform setup.
      
      The AR803x does not implement the RGMII 2ns TX clock delay in the trace
      routing nor via strapping. Add a detection method for the board and the
      PHY and enable the TX clock delay via the registers.
      
      This PHY will hibernate without link for 10 seconds. Ensure the PHY is
      awake for probe and then disable hibernation. A future improvement would
      be to convert pch_gbe to using PHYLIB and making sure we can wake the
      PHY at the necessary times rather than permanently disabling it.
      Signed-off-by: default avatarDarren Hart <dvhart@linux.intel.com>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Peter Waskiewicz <peter.p.waskiewicz.jr@intel.com>
      Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
      Cc: Joe Perches <joe@perches.com>
      Cc: netdev@vger.kernel.org
      f1a26fdf
    • Wolfram Sang's avatar
      drivers/net/ethernet/stmicro/stmmac: don't check resource with devm_ioremap_resource · 9025c8e2
      Wolfram Sang authored
      devm_ioremap_resource does sanity checks on the given resource. No need to
      duplicate this in the driver.
      Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9025c8e2
    • Darren Hart's avatar
      pch_gbe: Use PCH_GBE_PHY_REGS_LEN instead of 32 · b04d68eb
      Darren Hart authored
      Avoid using magic numbers when we have perfectly good defines just lying
      around.
      Signed-off-by: default avatarDarren Hart <dvhart@linux.intel.com>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Peter Waskiewicz <peter.p.waskiewicz.jr@intel.com>
      Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
      Cc: netdev@vger.kernel.org
      b04d68eb
    • Thomas Gleixner's avatar
      net: Make devnet_rename_seq static · 18afa4b0
      Thomas Gleixner authored
      No users outside net/core/dev.c.
      Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Acked-by: default avatarEric Dumazet <edumazet@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      18afa4b0
    • Eric Dumazet's avatar
      tcp: TCP_NOTSENT_LOWAT socket option · c9bee3b7
      Eric Dumazet authored
      Idea of this patch is to add optional limitation of number of
      unsent bytes in TCP sockets, to reduce usage of kernel memory.
      
      TCP receiver might announce a big window, and TCP sender autotuning
      might allow a large amount of bytes in write queue, but this has little
      performance impact if a large part of this buffering is wasted :
      
      Write queue needs to be large only to deal with large BDP, not
      necessarily to cope with scheduling delays (incoming ACKS make room
      for the application to queue more bytes)
      
      For most workloads, using a value of 128 KB or less is OK to give
      applications enough time to react to POLLOUT events in time
      (or being awaken in a blocking sendmsg())
      
      This patch adds two ways to set the limit :
      
      1) Per socket option TCP_NOTSENT_LOWAT
      
      2) A sysctl (/proc/sys/net/ipv4/tcp_notsent_lowat) for sockets
      not using TCP_NOTSENT_LOWAT socket option (or setting a zero value)
      Default value being UINT_MAX (0xFFFFFFFF), meaning this has no effect.
      
      This changes poll()/select()/epoll() to report POLLOUT
      only if number of unsent bytes is below tp->nosent_lowat
      
      Note this might increase number of sendmsg()/sendfile() calls
      when using non blocking sockets,
      and increase number of context switches for blocking sockets.
      
      Note this is not related to SO_SNDLOWAT (as SO_SNDLOWAT is
      defined as :
       Specify the minimum number of bytes in the buffer until
       the socket layer will pass the data to the protocol)
      
      Tested:
      
      netperf sessions, and watching /proc/net/protocols "memory" column for TCP
      
      With 200 concurrent netperf -t TCP_STREAM sessions, amount of kernel memory
      used by TCP buffers shrinks by ~55 % (20567 pages instead of 45458)
      
      lpq83:~# echo -1 >/proc/sys/net/ipv4/tcp_notsent_lowat
      lpq83:~# (super_netperf 200 -t TCP_STREAM -H remote -l 90 &); sleep 60 ; grep TCP /proc/net/protocols
      TCPv6     1880      2   45458   no     208   yes  ipv6        y  y  y  y  y  y  y  y  y  y  y  y  y  n  y  y  y  y  y
      TCP       1696    508   45458   no     208   yes  kernel      y  y  y  y  y  y  y  y  y  y  y  y  y  n  y  y  y  y  y
      
      lpq83:~# echo 131072 >/proc/sys/net/ipv4/tcp_notsent_lowat
      lpq83:~# (super_netperf 200 -t TCP_STREAM -H remote -l 90 &); sleep 60 ; grep TCP /proc/net/protocols
      TCPv6     1880      2   20567   no     208   yes  ipv6        y  y  y  y  y  y  y  y  y  y  y  y  y  n  y  y  y  y  y
      TCP       1696    508   20567   no     208   yes  kernel      y  y  y  y  y  y  y  y  y  y  y  y  y  n  y  y  y  y  y
      
      Using 128KB has no bad effect on the throughput or cpu usage
      of a single flow, although there is an increase of context switches.
      
      A bonus is that we hold socket lock for a shorter amount
      of time and should improve latencies of ACK processing.
      
      lpq83:~# echo -1 >/proc/sys/net/ipv4/tcp_notsent_lowat
      lpq83:~# perf stat -e context-switches ./netperf -H 7.7.7.84 -t omni -l 20 -c -i10,3
      OMNI Send TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 7.7.7.84 () port 0 AF_INET : +/-2.500% @ 99% conf.
      Local       Remote      Local  Elapsed Throughput Throughput  Local Local  Remote Remote Local   Remote  Service
      Send Socket Recv Socket Send   Time               Units       CPU   CPU    CPU    CPU    Service Service Demand
      Size        Size        Size   (sec)                          Util  Util   Util   Util   Demand  Demand  Units
      Final       Final                                             %     Method %      Method
      1651584     6291456     16384  20.00   17447.90   10^6bits/s  3.13  S      -1.00  U      0.353   -1.000  usec/KB
      
       Performance counter stats for './netperf -H 7.7.7.84 -t omni -l 20 -c -i10,3':
      
                 412,514 context-switches
      
           200.034645535 seconds time elapsed
      
      lpq83:~# echo 131072 >/proc/sys/net/ipv4/tcp_notsent_lowat
      lpq83:~# perf stat -e context-switches ./netperf -H 7.7.7.84 -t omni -l 20 -c -i10,3
      OMNI Send TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 7.7.7.84 () port 0 AF_INET : +/-2.500% @ 99% conf.
      Local       Remote      Local  Elapsed Throughput Throughput  Local Local  Remote Remote Local   Remote  Service
      Send Socket Recv Socket Send   Time               Units       CPU   CPU    CPU    CPU    Service Service Demand
      Size        Size        Size   (sec)                          Util  Util   Util   Util   Demand  Demand  Units
      Final       Final                                             %     Method %      Method
      1593240     6291456     16384  20.00   17321.16   10^6bits/s  3.35  S      -1.00  U      0.381   -1.000  usec/KB
      
       Performance counter stats for './netperf -H 7.7.7.84 -t omni -l 20 -c -i10,3':
      
               2,675,818 context-switches
      
           200.029651391 seconds time elapsed
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Cc: Neal Cardwell <ncardwell@google.com>
      Cc: Yuchung Cheng <ycheng@google.com>
      Acked-By: default avatarYuchung Cheng <ycheng@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c9bee3b7