[Samba] more smbd CPU mystery

[Dennis McLeod]

Is this a roaming profiles issue? 
Have you specifically turned off roaming profiles on the XP (Assuming XP
here) boxes?


Assuming XP, you control roaming profiles on the XP machine, not the 
Samba Server. 

On XP: 
Start, Run, type "gpedit.msc", hit enter. 
Expand "Computer Configuration" 
Expand "Administrative Templates" 
Expand "System" 
Highlight "User Profiles" 
Change "Prevent Roaming Profiles from propagating to the server" to enabled.


Change "Allow only local profiles" to Enabled. 
Logout and back in (or reboot.) 

HTH,
Dennis



 

> -----Original Message-----
> From: samba-bounces+dmcleod=foranyauto.com at lists.samba.org 
> [mailto:samba-bounces+dmcleod=foranyauto.com at lists.samba.org] 
> On Behalf Of Cochran, Wayne Owen
> Sent: Friday, October 24, 2008 3:46 PM
> To: samba at lists.samba.org
> Cc: wcochran at acm.org
> Subject: [Samba] more smbd CPU mystery
> 
> Well I have determined that everytime someone logs in/logs 
> out of a windows box in our lab *ALL* of the files in "My Directory"
> are copied from/to the file server to the local client. 
> Needless to say this is retarded and needs to stop. The local 
> sys admin needs to perform some windows voodoo to redirect 
> this directory.
> 
> Still this brings the mystery as to why smbd would take up so 
> much CPU. The work should mainly network and disk i/o bound 
> (not CPU bound).  nfsd doesn't have this kind of bad CPU 
> performance, why does smbd?
> 
> I had one of the users download a big file (which was being 
> saved on the desktop). During this I was running top on the 
> file server and noted it was continually soaking up 25% of the CPU:
> 
>   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  
> COMMAND      
> 12270 liffland  20   0 12748 4776 3628 S   24  0.1   1:02.36 
> smbd             
> 
> Why would disk/network traffic be so CPU heavy? Shouldn't 
> this mostly be handled by a DMA controller?  Can anyone explain this.
> 
> I was running strace -- here is a small sample:
> 
> rocess 12270 attached - interrupt to quit select(32, [5 21 
> 31], [], NULL, {59, 890000}) = 1 (in [5], left {59, 330000})
> read(5, "\0\0\0H", 4)                   = 4
> read(5, 
> "\377SMB2\0\0\0\0\30\7\310\0\0\0\0\0\0\0\0\0\0\0\0\4\0,"..., 
> 72) = 72 fstat64(34, {st_mode=S_IFREG|0744, st_size=65112414, 
> ...}) = 0 fcntl64(13, F_SETLKW64, {type=F_RDLCK, 
> whence=SEEK_SET, start=24480, len=1}, 0xbff627c4) = 0 
> fcntl64(13, F_SETLKW64, {type=F_UNLCK, whence=SEEK_SET, 
> start=24480, len=1}, 0xbff627e4) = 0 write(5, 
> "\0\0\0T\377SMB2\0\0\0\0\210A\310\0\0\0\0\0\0\0\0\0\0\0"..., 
> 88) = 88 gettimeofday({1224887351, 92207}, NULL) = 0 
> select(32, [5 21 31], [], NULL, {60, 0}) = 1 (in [5], left {60, 0})
> read(5, "\0\0\200@", 4)                 = 4
> read(5, 
> "\377SMB/\0\0\0\0\30\7\310\0\0\0\0\0\0\0\0\0\0\0\0\4\0\377"...
> , 32832) = 32832 pwrite64(34, 
> "V\307=\215\22\243\246\315\367\245Yw\303\31\305\6nLz\243"..., 
> 32768, 65112414) = 32768 write(5, 
> "\0\0\0/\377SMB/\0\0\0\0\210\1\310\0\0\0\0\0\0\0\0\0\0\0"..., 
> 51) = 51 gettimeofday({1224887351, 100692}, NULL) = 0 
> select(32, [5 21 31], [], NULL, {60, 0}) = 2 (in [5 31], left {60, 0})
> ioctl(31, FIONREAD, [64])               = 0
> read(31, 
> "\1\0\0\0\2\0\0\0\0\0\0\0000\0\0\0ubuntu-8.04.1-de"..., 64) = 
> 64 write(5, 
> "\0\0\0G\377SMB\240\0\0\0\0\210\1\310\0\0\0\0\0\0\0\0\0"..., 
> 75) = 75 gettimeofday({1224887351, 103900}, NULL) = 0 
> select(32, [5 21 31], [], NULL, {60, 0}) = 1 (in [5], left {60, 0})
> read(5, "\0\0\0H", 4)                   = 4
> read(5, 
> "\377SMB2\0\0\0\0\30\7\310\0\0\0\0\0\0\0\0\0\0\0\0\4\0,"..., 
> 72) = 72 fstat64(34, {st_mode=S_IFREG|0744, st_size=65145182, 
> ...}) = 0 fcntl64(13, F_SETLKW64, {type=F_RDLCK, 
> whence=SEEK_SET, start=24480, len=1}, 0xbff627c4) = 0 
> fcntl64(13, F_SETLKW64, {type=F_UNLCK, whence=SEEK_SET, 
> start=24480, len=1}, 0xbff627e4) = 0 write(5, 
> "\0\0\0T\377SMB2\0\0\0\0\210A\310\0\0\0\0\0\0\0\0\0\0\0"..., 
> 88) = 88 gettimeofday({1224887351, 114838}, NULL) = 0 
> select(32, [5 21 31], [], NULL, {60, 0}) = 1 (in [5], left {60, 0})
> read(5, "\0\0\0T", 4)                   = 4
> read(5, 
> "\377SMB\240\0\0\0\0\30\7\310\0\0\0\0\0\0\0\0\0\0\0\0\4"..., 
> 84) = 84 gettimeofday({1224887351, 119138}, NULL) = 0 
> select(32, [5 21 31], [], NULL, {60, 0}) = 1 (in [5], left {60, 0})
> read(5, "\0\0\200@", 4)                 = 4
> read(5, 
> "\377SMB/\0\0\0\0\30\7\310\0\0\0\0\0\0\0\0\0\0\0\0\4\0\377"...
> , 32832) = 32832 pwrite64(34, 
> "B\225\371\317\243y\32\216\223\16:\33\n\32\5P!i\230\231"..., 
> 32768, 65145182) = 32768 write(5, 
> "\0\0\0/\377SMB/\0\0\0\0\210\1\310\0\0\0\0\0\0\0\0\0\0\0"..., 
> 51) = 51 gettimeofday({1224887351, 126091}, NULL) = 0 
> select(32, [5 21 31], [], NULL, {60, 0}) = 1 (in [31], left {60, 0})
> ioctl(31, FIONREAD, [64])               = 0
> read(31, 
> "\1\0\0\0\2\0\0\0\0\0\0\0000\0\0\0ubuntu-8.04.1-de"..., 64) = 
> 64 write(5, 
> "\0\0\0G\377SMB\240\0\0\0\0\210\1\310\0\0\0\0\0\0\0\0\0"..., 
> 75) = 75 gettimeofday({1224887351, 128913}, NULL) = 0 
> select(32, [5 21 31], [], NULL, {60, 0}) = 1 (in [5], left {60, 0})
> 
> I don't know if that is helpful.
> 
> 
> Wayne O. Cochran
> Assistant Professor Computer Science
> wcochran at vancouver.wsu.edu
> 
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