Re: DMA transfers in 2.5.67

Andrew Morton (akpm@digeo.com)
Wed, 16 Apr 2003 03:13:03 -0700


Andrew Morton <akpm@digeo.com> wrote:
>
> 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.

Well you should include the sync if you're writing to disk ;)

doh.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/