Test you transfer from samba location? If not try use smbclient to connect w2k and test transfer. Second test is Another clean W2k station test.
Possible this can be a problem with kernel oplock, oplocks and level2 combination this is aplied when file is reading from samba disk but when writing to samba maybe not used with fast speed. Bye. ----- Original Message ----- From: "Nicolas Gieczewski" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Saturday, July 26, 2003 3:36 PM Subject: [Samba] Marginal write performance & pauses in outgoing transfers -Possible bug > Hello everybody, > > I have a FreeBSD 4.8-STABLE server running Samba 2.2.8a and a workstation > running Windows 2000 SP4. Whereas FTP transfers between these boxes average > 700 KB/s (10 mbps LAN) in both directions, Samba transfers are exhibiting > this odd behavior: > > Windows 2000 --> Samba = 700 KB/s (perfect) > Samba --> Windows 2000 = 100 KB/s (terrible, inconsistent, with LONG pauses) > > Trust me, I have tried *everything* I've run into as far as tuning goes, > so please don't ask if I've tuned up my stuff or request my configuration > file :) If this were a configuration-related issue, performance should be > the same no matter in which direction data is transferred. Nevertheless, > I have really tried everything that exists. Furthermore, I remember I didn't > have this problem with certain older version of Samba before I upgraded > my ports (unfortunately I don't remember which version it was, but I don't > really want to downgrade). > > The problem lies in the fact that outgoing transfers are not consistent and > undergo VERY long, random pauses. My hub's activity LED shows that, during > a transfer from Samba to Win2k, no packets are transferred about 70% of the > time. Yep, only during about 30% of the total time a transfer takes is there > actual network activity--the remaining 70% of the time is wasted on random > (both length-and interval-wise) pauses. When transferring the other way > around, though (Win2k --> Samba), it's just as fast as FTP (because I *do* > have my stuff properly tuned!), so fast in fact that it makes my hub's > excessive bandwidth alert LED go on ;) > > All my network cards are propery configured, both media- and duplex- wise. > There are no collissions. I don't even know why I'm saying this, because the > rates I can achieve with FTP both ways alone proves that Samba is the > culprit. > > Because most of the time a transfer takes to complete is wasted on those > random pauses, anything I could tune concerning buffer sizes and the like is > almost useless because it only takes effect while data is actually being > transferred, not during the pauses. I have fiddled with buffer sizes and, by > looking at the hub's activity light, I could (visually and easily) see how > more or less data was transferred in between the pauses depending on the > buffer sizes I chose. However, the pauses stayed consistent throughout all > my tests. By using larger buffer sizes, all I could do was push more data > through in between the pauses, but my tuning never affected the length or > interval of the pauses themselves. Buffer sizes are not the only thing I > fiddled with, and anyway, this was the same configuration file I had been > using with that older version of Samba that didn't have this problem, and > nothing changed in between. > > And again, the pretty good rate (for a 10 mbps LAN) I can achieve in > the Win2k --> Samba scenario proves that there's nothing wrong with > my configuration. > > Does anyone happen to know what could be causing this? I ran into a post > on the FreeBSD net mailing list posted a long time ago by someone who had > this same problem, but his difference between read and write performance > was much bigger, and that was an ancient version of Samba which had > certain wait flag turned on in the code. However, that was supposed to be > off by default in future versions. > > Please advice! > > Thanks in advance, > > Nicolas Gieczewski > Nix Software Solutions > http://www.nixsoftware.com/ > > -- > To unsubscribe from this list go to the following URL and read the > instructions: http://lists.samba.org/mailman/listinfo/samba -- To unsubscribe from this list go to the following URL and read the instructions: http://lists.samba.org/mailman/listinfo/samba
