1. 29 May, 2012 6 commits
  2. 25 May, 2012 8 commits
  3. 21 May, 2012 1 commit
  4. 18 May, 2012 2 commits
    • Sarah Sharp's avatar
      USB: Disable hub-initiated LPM for comms devices. · e1f12eb6
      Sarah Sharp authored
      
      
      Hub-initiated LPM is not good for USB communications devices.  Comms
      devices should be able to tell when their link can go into a lower power
      state, because they know when an incoming transmission is finished.
      Ideally, these devices would slam their links into a lower power state,
      using the device-initiated LPM, after finishing the last packet of their
      data transfer.
      
      If we enable the idle timeouts for the parent hubs to enable
      hub-initiated LPM, we will get a lot of useless LPM packets on the bus
      as the devices reject LPM transitions when they're in the middle of
      receiving data.  Worse, some devices might blindly accept the
      hub-initiated LPM and power down their radios while they're in the
      middle of receiving a transmission.
      
      The Intel Windows folks are disabling hub-initiated LPM for all USB
      communications devices under a xHCI USB 3.0 host.  In order to keep
      the Linux behavior as close as possible to Windows, we need to do the
      same in Linux.
      
      Set the disable_hub_initiated_lpm flag for for all USB communications
      drivers.  I know there aren't currently any USB 3.0 devices that
      implement these class specifications, but we should be ready if they do.
      Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
      Cc: Marcel Holtmann <marcel@holtmann.org>
      Cc: Gustavo Padovan <gustavo@padovan.org>
      Cc: Johan Hedberg <johan.hedberg@gmail.com>
      Cc: Hansjoerg Lipp <hjlipp@web.de>
      Cc: Tilman Schmidt <tilman@imap.cc>
      Cc: Karsten Keil <isdn@linux-pingi.de>
      Cc: Peter Korsgaard <jacmet@sunsite.dk>
      Cc: Jan Dumon <j.dumon@option.com>
      Cc: Petko Manolov <petkan@users.sourceforge.net>
      Cc: Steve Glendinning <steve.glendinning@smsc.com>
      Cc: "John W. Linville" <linville@tuxdriver.com>
      Cc: Kalle Valo <kvalo@qca.qualcomm.com>
      Cc: "Luis R. Rodriguez" <mcgrof@qca.qualcomm.com>
      Cc: Jouni Malinen <jouni@qca.qualcomm.com>
      Cc: Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com>
      Cc: Senthil Balasubramanian <senthilb@qca.qualcomm.com>
      Cc: Christian Lamparter <chunkeey@googlemail.com>
      Cc: Brett Rudley <brudley@broadcom.com>
      Cc: Roland Vossen <rvossen@broadcom.com>
      Cc: Arend van Spriel <arend@broadcom.com>
      Cc: "Franky (Zhenhui) Lin" <frankyl@broadcom.com>
      Cc: Kan Yan <kanyan@broadcom.com>
      Cc: Dan Williams <dcbw@redhat.com>
      Cc: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
      Cc: Ivo van Doorn <IvDoorn@gmail.com>
      Cc: Gertjan van Wingerde <gwingerde@gmail.com>
      Cc: Helmut Schaa <helmut.schaa@googlemail.com>
      Cc: Herton Ronaldo Krzesinski <herton@canonical.com>
      Cc: Hin-Tak Leung <htl10@users.sourceforge.net>
      Cc: Larry Finger <Larry.Finger@lwfinger.net>
      Cc: Chaoming Li <chaoming_li@realsil.com.cn>
      Cc: Daniel Drake <dsd@gentoo.org>
      Cc: Ulrich Kunitz <kune@deine-taler.de>
      Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
      e1f12eb6
    • Eric Dumazet's avatar
      iwlwifi: dont pull too much payload in skb head · 56138f50
      Eric Dumazet authored
      
      
      As iwlwifi use fat skbs, it should not pull too much data in skb->head,
      and particularly no tcp data payload, or splice() is slower, and TCP
      coalescing is disabled. Copying payload to userland also involves at
      least two copies (part from header, part from fragment)
      
      Each layer will pull its header from the fragment as needed.
      
      (on 64bit arches, skb_tailroom(skb) at this point is 192 bytes)
      
      With this patch applied, I have a major reduction of collapsed/pruned
      TCP packets, a nice increase of TCPRcvCoalesce counter, and overall
      better Internet User experience.
      
      Small packets are still using a fragless skb, so that page can be reused
      by the driver.
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Cc: Johannes Berg <johannes.berg@intel.com>
      Cc: Wey-Yi Guy <wey-yi.w.guy@intel.com>
      Reviewed-by: default avatarJohannes Berg <johannes.berg@intel.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      56138f50
  5. 16 May, 2012 23 commits