[Samba] ridiculous slow gigabit transfer, faster with VNC

samba at jdmc.org samba at jdmc.org
Thu Jul 19 21:20:07 GMT 2007

> Mark,
> I have noted the same behavior many times.
> I have an old server box that has not been upgraded since ver. 2.2.8.
> Whenever I connect from a linux box using sftp in a terminal, I get
> top speed 10/100 ethernet transfer rates over the LAN -- 10 Megs/sec.
> - 12 Megs/sec.
> When I use WinSCP (from a win client box), I get no more than 2
> Megs/sec. transfer rate.

  I ran into this when trying to rsync backups on a brand new gig-eth
  card on a 2.6.x kernel machine. Funny thing was, not only was the
  slow down machine specific, it was service specific as well. The
  following MAY work for you ...


/sbin/sysctl -w net.core.rmem_max=107374182
/sbin/sysctl -w net.core.wmem_max=107374182
/sbin/sysctl -w net.core.rmem_default=107374182
/sbin/sysctl -w net.core.wmem_default=107374182
/sbin/sysctl -w net.core.optmem_max=107374182
/sbin/sysctl -w net.ipv4.tcp_rmem="107374182 107374182 107374182"
/sbin/sysctl -w net.ipv4.tcp_wmem="107374182 107374182 107374182"
/sbin/sysctl -w net.ipv4.tcp_mem="107374182 107374182 107374182"
/sbin/sysctl -w net.core.netdev_max_backlog=1000
/sbin/ifconfig eth0 txqueuelen 1000
/sbin/sysctl -w net.ipv4.route.flush=1
/sbin/sysctl -w net.ipv4.tcp_no_metrics_save=1
/usr/sbin/ethtool -K eth0 tso off
# For  Intel e1000 NIC Users: Add "options e1000 RxDescriptors=4096" into

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