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    SubjectRE: very slow tar with deep trees on 2.1.131
    Date

    Mayby unnecessary scsi resets are the reason?

    Did you have a look into your /var/log/messages (or whatever it is)
    and find corresponding "scsi blablabla : resetting for second half of retries."
    messages in there?

    If this is the case, i think i've found a fix.
    Somebody changed the time calculation for resetting
    in drivers/scsi/scsi_obsolete.c (line 1116) between 2.1.130 and 2.1.131
    screwing at least aic7xxx (and maybe other low level scsi drivers using
    the _old_ scsi error handling stuff).

    See patch below.


    Regards,
    Heinz


    --- linux-2.1.131.orig/drivers/scsi/scsi_obsolete.c Sun Nov 29 19:40:31 1998
    +++ linux-2.1.130/drivers/scsi/scsi_obsolete.c Mon Nov 2 18:14:08 1998
    @@ -607,9 +607,10 @@
    if ((++SCpnt->retries) < SCpnt->allowed)
    {
    if ((SCpnt->retries >= (SCpnt->allowed >> 1))
    - /* FIXME: last_reset == 0 is allowed */
    - && time_after(jiffies, SCpnt->host->last_reset
    - + MIN_RESET_PERIOD)
    + /* FIXME: last_reset == 0 is allowed
    + * && !(SCpnt->host->last_reset > 0 */ &&
    + time_before(jiffies, SCpnt->host->last_reset
    + + MIN_RESET_PERIOD)
    && !(SCpnt->flags & WAS_RESET))
    {
    printk("scsi%d channel %d : resetting for second half of retries
    .\n",
    --
    =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

    Systemmanagement Entwicklungsbereich 2 Deutsche Telekom AG
    Entwicklungszentrum Darmstadt
    Heinz Mauelshagen Otto-Roehm-Strasse 71c
    Postfach 10 05 41
    mge@ez-darmstadt.telekom.de 64205 Darmstadt
    Germany
    +49 6151 886-425
    FAX-386
    =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-


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