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I'm having many little problems with my gigabit network. My hard drive reads at 85 MB/s, so why am I downloading from the ftp server at 68 MB/s? How could ...
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- 12-12-2008 #1
- Join Date
- Jun 2008
Gigabit network slow samba, ftp, iperf?
My hard drive reads at 85 MB/s, so why am I downloading from the ftp server at 68 MB/s? How could I diagnose what is eating those 17 MB/s?
Why does my windows machine have a slow 326 Mbit/s transmit speed compared with ubuntu's transmit speed of 763 Mbit/s when testing with iperf?
Why do I get slow samba speeds?
Windows is connected to Ubuntu with a 6 foot crossover cable. Both machines are fully updated.
motherboard: gigabit ga-965p-ds3
cpu: C2D E4400
hard drives: 250gb seagate, read = 85 MB/s
lan: marvel 8053 Gigabit LAN (onboard, PCI-E)
ubuntu 8.04 gateway
motherboard: Asus P5B-MX
cpu: C2D E2160
hard drive: 250gb seagate, read = 85 MB/s
lan: attansic® L1 PCI-E Gigabit LAN controller (onboard, PCI-E)
- windows pc downloading from gateway: 763 Mbit/s = 95 MB/s
- gateway downloading from windows pc: 326 Mbit/s = 41 MB/s
- windows pc downloading from gateway: 544 Mbit/s = 68 MB/s
- windows pc downloading from gateway: 194 MBit/s = 24 MB/s
- gateway downloading from windows pc: 160 MBit/s = 20 MB/s
[global] netbios name = SHWICK_GATEWAY server string = SHWICK_GATEWAY interfaces = lo, eth1 bind interfaces only = Yes map to guest = Bad User passdb backend = tdbsam syslog only = Yes socket options = TCP_NODELAY IPTOS_LOWDELAY SO_KEEPALIVE SO_RCVBUF=8192 SO_SNDBUF=8192 os level = 65 preferred master = Yes domain master = Yes dns proxy = No wins support = Yes invalid users = root [Media] path = /home/ftp/ create mask = 0640 directory mask = 0750 guest only = Yes guest ok = Yes
- 12-13-2008 #2
- Join Date
- Jun 2008
So I found how to make samba faster, I removed "SO_RCVBUF=8192 SO_SNDBUF=8192" from socket options. I let the tcp stack set the buffer size automatically now. 8192 was too small for a gigabit lan.
But is there any way I can improve the ftp speeds? The problem is server side, as I tested a download on both windows and from an ubuntu livecd, and both times it was 68 MB/s.