--- Begin Message ---
- To: Debian Bug Tracking System <submit@bugs.debian.org>
- Subject: mount.cifs: poor performance and high CPU load with large files (500MB+) compared to mount.smbfs
- From: Martin Koeppe <mkoeppe@gmx.de>
- Date: Tue, 17 May 2005 02:34:07 +0200
- Message-id: <E1DXq2h-0008K0-00@spohr.debian.org>
Package: smbfs
Version: 3.0.14a-1
Severity: normal
I run a Linux box within a VMware, a Windows Server 2003 and a
Windows 2000 Server (both not in VMware).
When copying a CD image file from within Linux to a cifs mounted
Win2003 share, I see a very poor performance and high CPU load
(about 90% system) on the Linux VM.
Copying begins with 3 MB/s (measured by mc), after 4% it suddenly stops
for say 10-20 seconds, then continues with 1..2 MB/s, but stopping
from time to time for several seconds. CPU load is only high while copying,
not in the pauses. Copying the whole file (700MB) took about 10 minutes.
Copying the same file in the same direction from a samba share
at the W2K3 box is very much faster, copying is finished in about a minute,
and CPU load on the Linux side is by far less.
When copying the same file from Linux to a cifs mounted Windows 2000
share, I get a similar picture: Copying begins with 3 MB/s, but soon slows
down to 1 MB/s with high CPU load. But here, it doesn't seem to have these
long idle times. Nevertheless copying takes about 10 minutes, too.
When mounting the Win2000 share with smbfs, however, I get about 4 MB/s
and a system load of approx. 35%. (This may indicate, that bug #203887
is indeed solved.)
I don't think it has anything to do with VMware as all other transfers
from and to this Linux VM are fast (NFS, HTTP, FTP, and Samba as mentioned).
(FTP and NFS copy performs with 10 MB/s)
I tried to compile a new kernel with the newest CIFS (1.34), but unfortunately
it doesn't compile with the Debian sarge kernel sources for 2.6.8,
neither plain 1.34 nor 1.34-RHEL4.
CIFS 1.34 does compile with Debian sid kernel 2.6.11, but unfortunately,
the VMware net driver doesn't work with this kernel, so I cannot test this.
I cannot test smbfs with W2K3 for comparison either, as I don't want to modify
the W2K3 settings to allow non-signed SMB.
On the Linux side I could test nearly everything, however, if somebody has
some more ideas what to test.
Martin
-- System Information:
Debian Release: 3.1
APT prefers testing
APT policy: (500, 'testing')
Architecture: i386 (i686)
Kernel: Linux 2.6.8-vmware-1 (from sarge kernel-source-2.6.8-15)
Locale: LANG=de_DE@euro, LC_CTYPE=de_DE@euro (charmap=ISO-8859-15)
Versions of packages smbfs depends on:
ii libc6 2.3.2.ds1-21 GNU C Library: Shared libraries an
ii libcomerr2 1.37-2 common error description library
ii libkrb53 1.3.6-2 MIT Kerberos runtime libraries
ii libldap2 2.1.30-6 OpenLDAP libraries
ii netbase 4.21 Basic TCP/IP networking system
ii samba-common 3.0.14a-1 Samba common files used by both th
-- no debconf information
--- End Message ---