[#4755] testsuites: atapi_hd_test.exp - performance test need "-o sync" option when mounting fs

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[#4755] testsuites: atapi_hd_test.exp - performance test need "-o sync" option when mounting fs

Submitted By: Yi Li

Open Date

2008-12-25 22:24:46     Close Date

2008-12-25 22:39:36

Priority:

Medium     Assignee:

Nobody

Status:

Closed     Fixed In Release:

N/A

Found In Release:

N/A     Release:

Category:

N/A     Board:

N/A

Processor:

N/A     Silicon Revision:

Is this bug repeatable?:

Yes     Resolution:

Assigned (Not Start)

Uboot version or rev.:

    Toolchain version or rev.:

App binary format:

N/A     

Summary: testsuites: atapi_hd_test.exp - performance test need "-o sync" option when mounting fs

Details:

 

The write speed performance test in this script does not use "-o sync" when mount.

I think "-o sync" option is necessary to bypass the page cache and test the "real" hard disk write speed.

 

With "-o sync":

root:/> mount -o sync /dev/sda1  /mnt/                                         

EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended 

root:/> time dd if=/dev/zero of=/mnt/100m.bin bs=1M count=100                  

100+0 records in                                                               

100+0 records out                                                              

real    0m 22.16s                                                              

user    0m 0.00s                                                               

sys     0m 13.24s 

 

4.5MB/s

 

Without "-o sync":

root:/> mount /dev/sda1  /mnt/                                                 

EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended          

root:/> time dd if=/dev/zero of=/mnt/100m.bin bs=1M count=100                  

100+0 records in                                                               

100+0 records out                                                              

real    0m 9.60s                                                               

user    0m 0.00s                                                               

sys     0m 5.05s

 

10.4MB/s

 

Follow-ups

 

--- Yi Li                                                    2008-12-25 22:39:36

duplicate. close.

 

--- Mike Frysinger                                           2008-12-25 23:35:41

duplicate of what ?

 

--- Yi Li                                                    2008-12-26 01:15:12

Bug [#4756]. I commit twice.

 

 

 

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