Re: sd_mod load is delayed.

[Andrey Borzenkov <arvidjaar@mail.ru>]

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On Sunday 29 January 2006 14:18, Hai Zaar wrote:
> > On Sunday 29 January 2006 13:12, Andrey Borzenkov wrote:
> > > As far as I can tell, SCSI subsystem is using scan mutex; so only one
> > > HBA can do scanning at a time. Or so it appears. May be LSI is the frst
> > > one to kick in.
> >
> > Oops sorry ignore this, what I meant is per-host mutex.
>
> Anyway, it does not seem to  help.
> Here are some numbers.
> Working directory is /sys/bus/pci/devices.
>   0000:00:1f.2 is SATA controller (ata_piix modalias)
>   0000:02:09.0 is LSI logic controller (mptspi modalias)
> Each command was run by /bin/bash, that was spawned right after 'udev
> --deamon' in initramfs. After each command, the system was rebooted:
>
> Emitting only SATA event
>     echo add > 0000:00:1f.2/uevent; time while ! grep -q sda
> /proc/partitions; do sleep 0.1; done
>     real 0m0.209sec
>     -----------------------------
>
> Emitting both SATA and LSI events
>     echo add > 0000:00:1f.2/uevent; echo add > 0000:02:09.0; time
> while ! grep -q sda /proc/partitions; do sleep 0.1; done
>     real 0m12.244s
>     -----------------------------
> As you may see there is significant increase. 

And for LSI only? 

- -andrey
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