Re: [RESEND] [PATCH] readahead:add blk_run_backing_dev

Vladislav Bolkhovitin
2009-07-10T08:43:57Z

Ronald Moesbergen, on 07/10/2009 10:32 AM wrote:
>> I've also long ago noticed that reading data from block devices is slower
>> than from files from mounted on those block devices file systems. Can
>> anybody explain it?
>>
>> Looks like this is strangeness #2 which we uncovered in our tests (the first
>> one was earlier in this thread why the context RA doesn't work with
>> cooperative I/O threads as good as it should).
>>
>> Can you rerun the same 11 tests over a file on the file system, please?
>
> I'll see what I can do. Just te be sure: you want me to run
> blockdev-perftest on a file on the OCFS2 filesystem which is mounted
> on the client over iScsi, right?

Yes, please.

> Ronald.
> --
> 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/
>