Why not work on Gigabit?

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Can anyone suggest why I have a Gigabit network is copied at a speed 12-13 MB/s...

If vintovoi (seven) machine to cut off the antivirus, then the file (2GB) begins to swing with a speed of 88 MB/s... but gradually the speed drops again to 13...

in Ubuntu, do all side... just 12-14 MB/s when you pull with seven.

with pump CP — 24 MB/s and poured at a speed of 11.7 MB/s and slides to a 9-10...

the network consists of:
  1. 1) 3 computers:
  2. a) Ubuntu 10.04 — integrated network card based on Realtek 8111C (percents — core2duo e7200, mother MSI P45 Neo-F)
  3. b) Windows 7 - built-in network card based on the Realtek RTL8211CL (percents — athlon x2 250, mother ASUS M2N68+)
  4. b) Windows XP — pci D-link (don't remember the specifics, know what a Gigabit) ( % — 2-core Celeron mother Gigabyte GA-G31M-ES2C)
  5. 2) switch D-Link DGS-1008D/GE
  6. 3) router TP-LINK TL-WR1043ND


upd1
blackgod@blackgod-desktop:/bin$ sudo iperf -s-p 8080
------------------------------------------------------------
Server listening on TCP port 8080
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[ 4] local 192.168.1.101 port 8080 connected with 192.168.1.102 port 52514
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-180.0 sec 9.23 GBytes 440 Mbits/sec


during the test, watched the loading of the network card, 60MB/s incoming, 1.1 MB/s outbound

upd2
blackgod@blackgod-desktop:~$ sudo dd if=/dev/sda of=/dev/null count=1000 bs=1M
1000+0 records read
1000+0 records written
copied 1048576000 would bytes (1.0 GB), 7,83156 c, 134 MB/s
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5 Answers

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Try to test the speed between nodes as described in this article.
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iperf everything.
Use the balls of horrible shit. IMHO
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poorly compressed or kinked cable could easily kill speed.
all this stuff about "bending radius should be not less than two inches", they are not just invented.
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I'm in shock! Elementary, the write speed of most modern HDD does not exceed 16 MB/sec.
Try to copy a large file to another folder on the same drive (not move, copy) — this is a physical limit =)
And 88 MB/s — Windows probably first caches in RAM, then flushes to disk.
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the usual is:
— problems with the definition of the mode of priemoperedachy (duplex and speed)
— bad/ no category patch cord
— a weak rendering of router/switch
\r
try to test the speed between the machines directly, change the cable
\r
\rsupport.microsoft.com/kb/325487
Common causes of connectivity problems are as follows:
* Network adapters and switch ports have mismatching duplex levels or transfer speed settings.
* Network adapters or switches with transmission rates of 10/100 megabits per second (Mbps) do not switch over correctly.
* Autosense Some settings may not correctly detect the speed of some network adapters.
* The network adapter is incompatible with the motherboard or other hardware or software components and drivers.
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