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Strange IP traffic behavior when using Samba and FTP (Windows/Mac to Linux)

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Top Forums UNIX for Advanced & Expert Users Strange IP traffic behavior when using Samba and FTP (Windows/Mac to Linux)
# 1  
Old 03-02-2005
Strange IP traffic behavior when using Samba and FTP (Windows/Mac to Linux)
I have set up a samba share on my Linux server. I have a gigabit switch, gigabit NICs in each machine.

I have set up the /etc/samba/smb.conf to support no delay, 8192 send/receive buffers, etc. This helped the rate for Samba go from about 4MB/S to about 10MB/S, but I expect to see about 30MB/S or better when I get done.

FTP performance and Samba performance writing to the Linux box are both at around 9-10MB/Sec, about 1/3 what I would expect, and about 1/3 the speed of a read. On the Linux box is a 7200RPM SATA drive, which is pretty quick, and is using XFS which should handle the large files well which I send.

Now the funny IP networking part of the problem.

When I send via FTP or Samba, I see my activity lights on my switch flicker at about 500ms or so intervals. If I start a second transfer from the same machine, I apparently get full bandwidth, at about 30+MB/Sec overall.

Why would starting a second transfer from the same box to Linux 'Open the gate' as it were?

Thanks in advance,

Rex McDonald
# 2  
Old 03-02-2005
Rex, Please read the rules of these forums - no duplicate postings. I deleted your other post and will leave this one.
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