Slow network problem

Pyun YongHyeon pyunyh at gmail.com
Sun Mar 29 19:00:13 PDT 2009


On Sat, Mar 28, 2009 at 10:41:17AM +0100, Sebastiaan van Doesselaar wrote:
> Dear all,
> 
> At the moment I'm running a CURRENT snapshot from February, yet  
> somehow my network speeds are quite low. I've tested this with iperf,  
> SMB and SCP, yet all give me more or less the same speeds, which is  
> about 50 - 60Mbps. The weird thing is that this is only the case when  
> the FreeBSD machine receives data, sending data is all fine. At least,  
> with a 100Mbps link iperf gives me quite decent speeds (>90Mbps)
> 
> This is the case for gigabit as well as 100Mbps, depending on what  
> cable I use to the switch.
> I've also tested this directly, with a cable to a machine, but this  
> was to no avail. I've tried changing some variables with sysctl  
> (net.inet.tcp.recvspace, sendspace, recvbuf_auto,  
> kern.ipc.maxsockbuf), yet those did not do anything.
> 
> dmesg has this to say about the network card:
> rgephy0: <RTL8169S/8110S/8211B media interface> PHY 1 on miibus0  
> rgephy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT,  
> 1000baseT-FDX, aut
> 

Show me complete dmesg output, the above just tells what PHY
hardware is used.

> I cannot say I've tested this with a STABLE release, but in Windows  
> and Gentoo Linux this worked fine.
> 
> I have found one person with a seemingly similar problem, but this  
> person had the problem a couple of years ago and did not resolve it at  
> the time, or so it seems. See 
> http://kerneltrap.org/mailarchive/freebsd-hackers/2006/5/30/214298 for his 
>  thread.
> 
> I hope someone can give me some tips that will solve this problem. If  
> information is lacking, please do say so.
> 


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