From: Riddoch, John E SITI-ITDSEP3 (John.E.Riddoch@is.shell.com)
Date: Fri Oct 04 2002 - 03:51:57 EDT
I've been working at testing our Samba server's performance compared to a
Windows 2000 server and we're having some issues. The primary problem is
that when saving a project from one application, it takes 2 seconds on the
Win2k server, it takes 10 seconds (or more!) via Samba.
I've done a truss -D to track how long syscalls are taking, and I've noticed
the following appearing a few times:
0.0110 send(8, "\0\0\0 #FF S M B 201\002".., 39, 0) = 39
i.e it's taking > .01 seconds to send 39 bytes out of a gigabit ethernet
connection, to a 100Mbit connection on the client.
What I think _might_ be happening is that Solaris might be waiting for more
data, to try and avoid sending small packets to the client; after .01
seconds, it stops waiting and sends the small packet anyway. Is there any
way to disable this? I'm pretty certain this isn't related to the TCP
slow/fast startup, as the TCP connection has already been created.
Any pointers on speeding this up would be appreciated.
NB: the data is held on an NFS server (running AIX) and the bottleneck may
be in that; I haven't had a chance to test using local disk as yet as a
comparison. In any case, I still think it's ludicrous that it should take a
hundredth of a second to send 39 bytes.
Note on hardware:
Samba is running on V880 with onboard Gbit ethernet, 4 750MHz CPUs & 8GB.
Solaris 8.
Windows client is Windows 2000, SP2
Summary as usual.
John Riddoch
Unix Project Engineer
Shell Information Technology International Limited
Loirston House, Wellington Road, Altens, Aberdeen AB12 3BH
Tel: +44(0)1224 21 7660 Fax: 7502
Email: John.E.Riddoch@is.shell.com
Internet: http://www.shell.com
_______________________________________________
sunmanagers mailing list
sunmanagers@sunmanagers.org
http://www.sunmanagers.org/mailman/listinfo/sunmanagers
This archive was generated by hypermail 2.1.7 : Wed Apr 09 2008 - 23:25:03 EDT