Re: Re: PATCH for ide_floppy

[Manfred.Scherer.Mhm@xxxxxxxxxxx]

it's not really a performance issue but more a timeout issue.
'IDEFLOPPY_TICKS_DELAY  60' avoids error messages in /var/log/messages
like 'reset ide ...'.
Without the idefloppy_timer_expiry the data transfer to the ide-floppy
is pending a long time between some transfer of data. The floppy LED
indicated this too.
With kernel 2.4.x I've never had this problem.

Manfred Scherer




-----Original Message-----
Date: Fri,  1 Jul 2005 18:15:34 +0200
Subject: Re: PATCH for ide_floppy
From: Jens Axboe <axboe@xxxxxxx>
To: "Manfred.Scherer.Mhm@xxxxxxxxxxx" <Manfred.Scherer.Mhm@xxxxxxxxxxx>

On Fri, Jul 01 2005, Manfred.Scherer.Mhm@xxxxxxxxxxx wrote:
> --- linux-2.6.12/drivers/ide/ide-floppy.c.ORIG  2005-06-17
> 21:48:29.000000000 +0200
> +++ linux-2.6.12/drivers/ide/ide-floppy.c       2005-06-25
> 03:29:45.000000000 +0200
> @@ -125,7 +125,14 @@
>  /*
>   *     Some drives require a longer irq timeout.
>   */
> +#if 0
>  #define IDEFLOPPY_WAIT_CMD             (5 * WAIT_CMD)
> +#endif
> +#if 0
> +#define IDEFLOPPY_WAIT_CMD             200     /* --ms  */
> +#endif
> +#define IDEFLOPPY_WAIT_CMD             WAIT_CMD        /* 2004/12/31
> --ms */
> +
>
>  /*
>   *     After each failed packet command we issue a request sense
> command
> @@ -317,7 +324,13 @@
>         unsigned long flags;
>  } idefloppy_floppy_t;
>
> +#if 0
>  #define IDEFLOPPY_TICKS_DELAY  3       /* default delay for ZIP 100
*/
> +#define IDEFLOPPY_TICKS_DELAY  6       /* default delay for ZIP 100
> --ms 2005/01/01 */
> +#define IDEFLOPPY_TICKS_DELAY  12      /* default delay for ZIP 100
> --ms 2005/01/01 */
> +#endif
> +#define IDEFLOPPY_TICKS_DELAY  60      /* default delay for ZIP 100
> --ms 2005/01/07 */
> +

This seems to be basically what your patch changes, along with the
expiry addition. Neither of which should make any change in performance,
since you should normally not time commands out. Do you normally get
lots of errors or timeouts running that workload?

I don't see how your patch changes anything for a normally running
ide-floppy.

--
Jens Axboe



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