Synopsis: samba 2.0.6 running under FreeBSD 3.3-RELEASE is much faster
than the same running under FreeBSD 3.4-RELEASE, even after
replacing the 3.4-RELEASE kernel with the 3.4-STABLE kernel.
(This has been reported to FreeBSD GNATS as "kern/16605")
I have 2.0.6 running under FreeBSD using the following smb.conf:
[global]
workgroup = <NT Domain>
server string = Samba Server
load printers = yes
log level = 3
debug level = 3
log file = /var/log/log.%m
max log size = 5000
security = domain
password server = <NT Domain PDC>
encrypt passwords = yes
#per www.freibergnet.de (Martin Welk)
# following is used under 3.3-RELEASE
socket options = IPTOS_LOWDELAY TCP_NODELAY SO_SNDBUF=262144 SO_RCVBUF=262144
# following is used under 3.3-RELEASE
# socket options = IPTOS_LOWDELAY TCP_NODELAY SO_SNDBUF=132072 SO_RCVBUF=132072
os level = 0
wins server = 129.79.1.200
dns proxy = no
#============================ Share Definitions =============================
(rest deleted, not an issue)
System is a dual PPro200/512, Everex PO-6200/EVX-3, 64MB, 4 ST410800WD on
a Symbios wide diff controller, CD on Symbios SE narrow controller, Intel
Pro100B NIC.
For security reasons I'm moving the 3.4-RELEASE (beginning to think I should
finally learn CVS and run -STABLE). The 3.4-RELEASE system is the same,
except the SCSI controllers are Adaptec 2944UW/2940U.
Problem 1: With any combination of kernels compiled from 3.4-RELEASE sources
and 2.0.6 taken from the binary distribution, compiled from ports,
compiled from sources directly, samba can't allocate buffers:
............, 0] lib/util_sock.c:set_socket_options(151)
Failed to set socket option SO_SNDBUF (Error No buffer space available)
............, 0] lib/util_sock.c:set_socket_options(151)
Failed to set socket option SO_RCVBUF (Error No buffer space available)
Fix: Get the 3.4-STABLE sources and compile a new kernel.
Problem 2: After fixing the buffer problem throughput is usable, but
slow. The 3.3-RELEASE box holds a steady 2MB/sec for large
files (100Mbit connection to NT 4 workstation client) but the
3.4-RELEASE/STABLE system starts very high, 3-4 MB/sec, and
declines rapidly to a maximum of about 500K/sec. The effect
of different buffer sizes is as follows:
Size Speed in K/sec, 32MB file
of SO_[RCV,SND]BUF Written by TESTNET, 500 65K blocks
16384 50K/sec (3.4-STABLE)
32768 97K/sec (3.4-STABLE)
65535 450K/sec (3.4-STABLE)
131072 410K/sec (3.4-STABLE)
262144 1980K/sec (3.3-RELEASE)
