Windows Redirector Abnomality

[Ephi Dror]

Hello Samba,

We are running some performance testing in having the following question:

When an application on Windows clients sequentially writes to a file
on a remote system (samba server) using block (IO) size of 256KB, the Windows
Redirector splits each request into 4 SMB_WRITE_ANDX requests each
of size 64KB and sends the requests in parallel to the remote server
without waiting for response. Here is the network capture:

Application write request (256KB):
    Send SMB_WRITE_ANDX (64KB)
    Send SMB_WRITE_ANDX( 64KB)
    Send SMB_WRITE_ANDX (64KB)
    Send SMB_WRITE_ANDX (64KB)
    Wait for replies
Return result to application

When an application on a Windows clients sequentially reads from a file
on a remote system (samba server) using block (IO) size of 256KB, the Windows
Redirector splits each request into 4 SMB_READ_ANDX requests each of
size 60KB and 1 request of size 16KB. In addition, the read requests are
not sent in parallel.

Application read request (256KB):
    Send SMB_READ_ANDX (60KB)
    Wait for reply
    Send SMB_READ_ANDX (60KB)
    Wait for reply
    Send SMB_READ_ANDX (60KB)
    Wait for reply
    Send SMB_READ_ANDX (60KB)
    Wait for reply
    Send SMB_READ_ANDX (16KB)
    Wait for reply
Return result to application

Is there any Registry setting on the Windows client to make reads in
parallel as well?

The remote server has advertized maxmumim multiplexed commands 50.

Thank you,

Ephi and Hames