Re: DMA transfers in 2.5.67

Andrew Morton (akpm@digeo.com)
Wed, 16 Apr 2003 03:11:44 -0700

Chuck Ebbert <76306.1226@compuserve.com> wrote:
>
> # mount /ext3_fs
> # time dd if=/ext3_fs/100MiB_file of=/dev/null bs=32k
>
> 2.4.20aa1 : 3.3 sec (exactly what I expect to see)
> 2.5.66 : 6.6 sec

With this test 2.4 will leave a lot more unwritten dirty data in memory.

You should include a `sync' in the timings.
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