Performance of over a (Open)VPN is terribly slow

[Herwig Bauernfeind]

When running Samba connections over a VPN connection (using OpenVPN for OS/2 by Pavel Shtemenko from hobbes on both sides), transfer speed is really slow.

The tests were done on the same connection within 10 minutes:

• Transfer speed using Netdrive/ndpsmb: 1,5 to 3,0 KB/s
  
• Transfer speed using smbclient.exe: 30,0 to 50,0 KB/s
  
• Transfer speed using FTP: 30,0 to 50,0 KB/s
  

smbclient.exe is Version 3.0.33 (but that does not matter most likely). I will attach logfiles later.

[Herwig Bauernfeind]

Further investigation reveals:

1. Problem occurs when writing to the share over VPN, not when reading.
   
2. Server jumps to 100% CPU usage as soon as the first bytes are written, which explains why transfer is so slow.
3. Tested Samba Server Version 3.0.31.

[Herwig Bauernfeind]

The above explorations suggest a different source (server not client!)

[Herwig Bauernfeind]

Works with the following incarnation of OS2_EAGAIN_RETRY_CHECK macro (both read and write):

#define OS2_EAGAIN_RETRY_INIT time_t t1 = time(NULL); #define OS2_EAGAIN_RETRY_CHECK \

if (ret == -1) { \

DEBUG(10,("sys_read: op failed, errno: %d,%s\n", errno, strerror(errno))); \

} \ if (ret==-1 && errno==EAGAIN) { \

DosSleep(100); \ if (time(NULL) - t1 > 60) \

break; \

errno = EINTR; \

}

#else #define OS2_EAGAIN_RETRY_INIT #define OS2_EAGAIN_RETRY_CHECK #endif

[Herwig Bauernfeind]

This Ticket is closely related to Ticket #69

[Silvan Scherrer]

Changeset http://svn.netlabs.org/samba/changeset/170 fixes this issue.