[Samba] Re: samba performance on uclinux embedded system

[David Collier-Brown -- Customer Engineering]

[starting to get off-topic, moved to samba at lists.samba.org]

 I reccomend RAID striped across six drives, so that there
is (nearly) always a physical head available to
read or write the data.  This tends to hide the normal
elevator-like scan algorithm used by Unix from the
program, and delivers higher throughput.

--dave


hong joy wrote:
> Dave,
> We write a program to open a file and then write file
> to test the IDE and got the IDE throughput 10.5M bps. 
> 
> What is 'a 6-wide stripe' ?
> 
> We try to do zero-copy for file-open-write, just
> something like zero-copy in linux tcpip stack. Any
> advice?
> 
> Thanks a lot! Happy hacking!
> 
> Regards,
> Joy
> 
>  --- David Collier-Brown -- Customer Engineering
> <David.Collier-Brown at Sun.COM> µÄÕýÎÄ£º> 
> 
>>hong joy wrote:
>>
>>>Hello,
>>>Did anyone do some work on improving the samba
>>>read/write performance?
>>>We've got a board attached with an IDE hadisk,
>>
>>running
>>
>>>samba 2.0.7 on uClinux(NOMMU) OS, the IDE
>>
>>throughput:
>>
>>>10.5Mbps,ethernet speed: 16Mbps,Samba
>>
>>throughput(copy
>>
>>>file from WINDOWS PC to host board ):
>>
>>600KByte/s,CPU
>>
>>>working at 120MHz, system SDRAM 16Mbyte.
>>>Could anyone help to figure out where the
>>
>>bottleneck
>>
>>>is and how to tune it?
>>>Thanks a lot!
>>>Happy hacking...
>>
>>  Even assuming a 10,000-rpm disk, you'll bottleneck
>>on
>>disk I/O: a single disk head with the normal Unix
>>elevator algorithm (ext2 or 3 fs) will peak out at
>>about 800 KB/S, because the total sequential-read
>>throughput can't be acheived, courtesy of all the
>>seeking about.  I'd reccomend about a 6-wide stripe
>>or better.
>>
>>--dave
>>
>>
>>
>>
>>>hn
>>>
>>>
>>>
>>
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>>-- 
>>David Collier-Brown,           | Always do right.
>>This will gratify
>>Sun Microsystems DCMO          | some people and
>>astonish the rest.
>>Toronto, Ontario               |
>>(905) 415-2849 or x52849       |
>>davecb at canada.sun.com
>>
>> 
> 
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-- 
David Collier-Brown,           | Always do right. This will gratify
Sun Microsystems DCMO          | some people and astonish the rest.
Toronto, Ontario               |
(905) 415-2849 or x52849       | davecb at canada.sun.com