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External
Since: Feb 03, 2007
Posts: 2
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(Msg. 1) Posted: Sat Feb 03, 2007 1:37 pm
Post subject: Bug in kernel_task when using an Adaptec 2940 SCSI card under OS 10.4.x
Archived from groups: comp>sys>mac>hardware>storage, others (more info?)
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I thought I would share an experience I had recently with an Adaptec
2940 SCSI crd in my QuickSilver 733.
My current system has the PCI SCSI card, and in the SCSI chain are a
Zip250 and a Microtek ScanMaker 4. There is a terminator on the
ScanMaker 4, and the Zip250 has its termination disabled.
I recently had to use the Zip250 on an old Powerbook 165C so I
disconnected the SCSI chain from the QuickSilver, and hooked it up to
the PowerBook. When I was done I never hooked the chain back up to the
QuickSilver. (I was too lazy to shut down and reconnect, and then
restart).
That was about a week ago. For the past week, I've had kernel_task CPU
utilization of about 75% on average, taking up over 1GB of virtual
memory. I couldn't for the life of me figure out what was going on,
until I realized everything started when I disconnected the SCSI chain.
Once I reconnected the chain, kernel_task CPU% went back down to a
respectable 2% on average!
I didn't install any additional drivers for the SCSI card, only what was
included in the 10.4.0 install DVD.
I'm thinking that the kernel_task slows itself down when it has a dirty
SCSI bus: one that isn't terminated. So if you have a SCSI card in your
PCI based system, you should always terminate it even if there are no
devices on the chain!
Cheers.
-Patrick |
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External
Since: Jul 29, 2005
Posts: 186
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(Msg. 2) Posted: Sat Feb 03, 2007 1:37 pm
Post subject: Re: Bug in kernel_task when using an Adaptec 2940 SCSI card under OS 10.4.x [Login to view extended thread Info.]
Imported from groups: per prev. post (more info?)
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External
Since: Apr 12, 2007
Posts: 451
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(Msg. 3) Posted: Sun Feb 04, 2007 12:11 am
Post subject: Re: Bug in kernel_task when using an Adaptec 2940 SCSI card under OS 10.4.x [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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On 2007-02-03 12:37:55 -0600, patrick.DeleteThis@NOtendim.cjb.netSPAM (pmp) said:
> I thought I would share an experience I had recently with an Adaptec
> 2940 SCSI crd in my QuickSilver 733.
Yep - you're going to have nothing but problems with 10.4 + and Adaptec
SCSI cards. Your best bet is to move to Firewire & USB devices.
--
JR |
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External
Since: Jun 04, 2005
Posts: 300
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(Msg. 4) Posted: Sun Feb 04, 2007 12:11 am
Post subject: Re: Bug in kernel_task when using an Adaptec 2940 SCSI card under OS 10.4.x [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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On Sat, 3 Feb 2007 19:11:40 -0500, Jolly Roger wrote
(in article <2007020318114055597-jollyroger@nullorg>):
> On 2007-02-03 12:37:55 -0600, patrick RemoveThis @NOtendim.cjb.netSPAM (pmp) said:
>
>> I thought I would share an experience I had recently with an Adaptec
>> 2940 SCSI crd in my QuickSilver 733.
>
> Yep - you're going to have nothing but problems with 10.4 + and Adaptec
> SCSI cards. Your best bet is to move to Firewire & USB devices.
>
>
Err... correct me if I'm wrong, but isn't true that Adaptec has abandoned the
2940 for Macs and that the last driver update as released in 1999, for OS 9,
and that the 2940 is not supported, period, under OS X? In fact, hasn't
Adaptec bailed completely from the Mac market, as indicated at this page here
<http://www.adaptec.com/en-US/support/_updates/mac_osx_info.htm>? Apparently
there haven't been any updates for any Adaptec Mac product, period, since
2002, and there never will be any more. Ever.
With that level of support I'd say that it's a miracle that those cards have
worked this long!
I personally last used a 2940 with a beige G3 which was running OS X 10.2. It
worked, but I last touched that particular machine in about 2002, or about
when Adaptec bailed completely.
--
email to oshea dot j dot j at gmail dot com. |
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External
Since: Jun 30, 2006
Posts: 109
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(Msg. 5) Posted: Sun Feb 04, 2007 3:08 am
Post subject: Re: Bug in kernel_task when using an Adaptec 2940 SCSI card under OS 10.4.x [Login to view extended thread Info.]
Imported from groups: per prev. post (more info?)
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External
Since: Apr 12, 2007
Posts: 451
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(Msg. 6) Posted: Sun Feb 04, 2007 3:22 am
Post subject: Re: Bug in kernel_task when using an Adaptec 2940 SCSI card under OS 10.4.x [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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On 2007-02-03 21:17:27 -0600, J.J. O'Shea <try.not.to.TakeThisOut@but.see.sig> said:
> On Sat, 3 Feb 2007 19:11:40 -0500, Jolly Roger wrote
> (in article <2007020318114055597-jollyroger@nullorg>):
>
>> On 2007-02-03 12:37:55 -0600, patrick.TakeThisOut@NOtendim.cjb.netSPAM (pmp) said:
>>
>>> I thought I would share an experience I had recently with an Adaptec
>>> 2940 SCSI crd in my QuickSilver 733.
>>
>> Yep - you're going to have nothing but problems with 10.4 + and Adaptec
>> SCSI cards. Your best bet is to move to Firewire & USB devices.
>
> Err... correct me if I'm wrong, but isn't true that Adaptec has abandoned the
> 2940 for Macs and that the last driver update as released in 1999, for OS 9,
> and that the 2940 is not supported, period, under OS X? In fact, hasn't
> Adaptec bailed completely from the Mac market, as indicated at this page here
> <http://www.adaptec.com/en-US/support/_updates/mac_osx_info.htm>? Apparently
> there haven't been any updates for any Adaptec Mac product, period, since
> 2002, and there never will be any more. Ever.
>
> With that level of support I'd say that it's a miracle that those cards have
> worked this long!
>
> I personally last used a 2940 with a beige G3 which was running OS X 10.2. It
> worked, but I last touched that particular machine in about 2002, or about
> when Adaptec bailed completely.
Yep. That is precisely why I said he will have nothing but problems,
and his best bet is to upgrade those old SCSI devices to Firewire / USB
devices.
--
JR |
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External
Since: Jun 04, 2005
Posts: 300
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(Msg. 7) Posted: Sun Feb 04, 2007 3:22 am
Post subject: Re: Bug in kernel_task when using an Adaptec 2940 SCSI card under OS 10.4.x [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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On Sat, 3 Feb 2007 22:22:27 -0500, Jolly Roger wrote
(in article <2007020321222765340-jollyroger@nullorg>):
> On 2007-02-03 21:17:27 -0600, J.J. O'Shea <try.not.to.TakeThisOut@but.see.sig> said:
>
>> On Sat, 3 Feb 2007 19:11:40 -0500, Jolly Roger wrote
>> (in article <2007020318114055597-jollyroger@nullorg>):
>>
>>> On 2007-02-03 12:37:55 -0600, patrick.TakeThisOut@NOtendim.cjb.netSPAM (pmp) said:
>>>
>>>> I thought I would share an experience I had recently with an Adaptec
>>>> 2940 SCSI crd in my QuickSilver 733.
>>>
>>> Yep - you're going to have nothing but problems with 10.4 + and Adaptec
>>> SCSI cards. Your best bet is to move to Firewire & USB devices.
>>
>> Err... correct me if I'm wrong, but isn't true that Adaptec has abandoned
>> the
>> 2940 for Macs and that the last driver update as released in 1999, for OS 9,
>> and that the 2940 is not supported, period, under OS X? In fact, hasn't
>> Adaptec bailed completely from the Mac market, as indicated at this page
>> here
>> <http://www.adaptec.com/en-US/support/_updates/mac_osx_info.htm>? Apparently
>> there haven't been any updates for any Adaptec Mac product, period, since
>> 2002, and there never will be any more. Ever.
>>
>> With that level of support I'd say that it's a miracle that those cards have
>> worked this long!
>>
>> I personally last used a 2940 with a beige G3 which was running OS X 10.2.
>> It
>> worked, but I last touched that particular machine in about 2002, or about
>> when Adaptec bailed completely.
>
> Yep. That is precisely why I said he will have nothing but problems,
> and his best bet is to upgrade those old SCSI devices to Firewire / USB
> devices.
>
>
I thought so. That same beige G3 had a FireWire card in it as well as the
Adaptec card. I used it to migrate from SCSI drives to FireWire drives. I
haven't used a SCSI device since I stopped using that machine.
--
email to oshea dot j dot j at gmail dot com. |
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