Re: data loss in 2.6.9-rc1-mm1

[Gergely Tamas]

Hi!

 > What does ls -l testfile.1 give?

$ ls -l testfile{,.1}
-rw-r--r--  1 dice users 10485760 Aug 27 13:25 testfile
-rw-r--r--  1 dice users 10481664 Aug 27 13:25 testfile.1

 > What you describe actually can be correct behaviour, since the file is
 > all zeros.

Same test with other source file...

$ dd if=linux-2.6.8.1.tar.bz2 of=testfile bs=$((1024*1024)) count=10
10+0 records in
10+0 records out
10485760 bytes transferred in 0.061916 seconds (169354917 bytes/sec)

$ du -sb testfile
10485760        testfile

$ cat testfile > testfile.1

$ du -sb testfile.1
10481664        testfile.1

 > Although yes, it seems highly improbable someone implemented an 
 > optimization that cuts away just one of 2560 pages.

Thanks,
Gergely
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