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[Jah <thejar@xxxxxxxxxxxxx>]

setting  kernel parameter "mem=16384M" did not help
 (was set via grub GRUB_CMDLINE_LINUX="mem=16384mb")

killing lightgm resolves the problem and speed jumps to 12mb/s . But
once back in GUI, problem returns.

Tested using Netcat and  iperf, LAN speeds peek out at 1.2MB/s

Effected:
PC1
Desotop, Ram Page 3 Extreme motherboard:
Description:	Ubuntu 14.04.1 LTS
Linux ubuntu 3.13.0-34-generic #60-Ubuntu SMP Wed Aug 13 15:45:27 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
network               
       description: Ethernet interface
       product: 82567V-2 Gigabit Network Connection
       vendor: Intel Corporation
       physical id: 19
       bus info: pci@0000:00:19.0
       logical name: eth1
       version: 00
       size: 1Gbit/s
       capacity: 1Gbit/s
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=2.3.2-k duplex=full firmware=1.8-5 ip=10.10.10.121 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
       resources: irq:75 memory:f7de0000-f7dfffff memory:f7ddf000-f7ddffff ioport:9c00(size=32)

LAPTOP 1
Description:	Ubuntu 12.04.4 LTS
Linux user 3.11.0-26-generic #45~precise1-Ubuntu SMP Tue Jul 15 04:04:35 UTC 2014 i686 i686 i386 GNU/Linux

network
       description: Ethernet interface
       product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:09:00.0
       logical name: eth0
       version: 05
       serial: 88:ae:1d:49:8e:f3
       size: 100Mbit/s
       capacity: 100Mbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl_nic/rtl8168e-2.fw ip=192.168.9.19 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
       resources: irq:43 ioport:2000(size=256) memory:f050c000-f050cfff memory:f0508000-f050bfff

+ several other laptops/computers.

Older laptops are not effected.

Ilya your post where my guiding stars! Thank you.

Also, I think issues like “Remote Desktop VNC very slow”
http://ubuntuforums.org/showthread.php?t=1752116&page=2
and many others could have been results of this bug and users not realising that LAN speed is the issue..


Issue remains unresolved for me.

-- 
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1264707

Title:
  IO limit 1.2 MB/s for 32bit ubuntu (PAE, 32 Gb RAM)

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I recently installed a new motherboard Asus M5A99FX PRO R2.0 and found out that IO speed is very low; i.e.  the dd command output:
  dd if=/dev/zero of=/tmp/output bs=8k count=1000k
  ^C13885+0 records in
  13885+0 records out
  113745920 bytes (114 MB) copied, 99.6639 s, 1.1 MB/s

  This issue is reproducing with my new SSD (with ext4), my USB drives
  and my hard disk (with ext4) from Ubuntu i386, 13.04 and 13.10. Such a
  speed is not ok, awfully slow. When I run two or more the same dd
  commands simultaneously,  I have 1,2 Mb/s for every process.

  WORKAROUNDs:
  + turn off ACPI services, see more at https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1264707/comments/18
  + Use the amd64 version
  + Use CONFIG_HIGHMEM4G=y
  + CONFIG_VMSPLIT_1G=y

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-12-generic 3.11.0-12.19
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic i686
  ApportVersion: 2.12.5-0ubuntu2
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  ubuntu     4507 F.... pulseaudio
   /dev/snd/controlC1:  ubuntu     4507 F.... pulseaudio
   /dev/snd/controlC0:  ubuntu     4507 F.... pulseaudio
  CasperVersion: 1.336ubuntu1
  Date: Sat Dec 28 15:56:33 2013
  IwConfig:
   lo        no wireless extensions.

   eth0      no wireless extensions.
  LiveMediaBuild: Ubuntu 13.10 "Saucy Salamander" - Release i386 (20131016.1)
  MachineType: To be filled by O.E.M. To be filled by O.E.M.
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=en_US
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: noprompt cdrom-detect/try-usb=true persistent file=/cdrom/preseed/hostname.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-12-generic N/A
   linux-backports-modules-3.11.0-12-generic  N/A
   linux-firmware                             1.116
  RfKill:

  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/10/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1708
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: M5A99FX PRO R2.0
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1708:bd04/10/2013:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKCOMPUTERINC.:rnM5A99FXPROR2.0:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To be filled by O.E.M.
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: To be filled by O.E.M.

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