--279709697-242958898-901885633=:13502
Content-Type: TEXT/PLAIN; charset=US-ASCII
Firstly, since I was reading the SCSI code anyway I thought I
might as well do some work.
The serious one is eata_dma.c which allocates memory for scatter
gather as need with GFP_ATOMIC - and panics if it fails. I actually
managed to get ahead of kswapd enough to trigger this(!) so I changed
it to return a BUS_BUSY instead.
The rest is general clean up: scsi_init_malloc() always zeros
the memory before it returns it so there is no need to do it again
in the caller.
Then the problems...
On Wed, 29 Jul 1998, Mike Jagdis wrote:
> Tonight will switch the Future Domain for another DPT.
Did it. Wished I hadn't. Failed consitently with hardware controller
lock ups. Different boards, different ways. I was lucky if it
managed to get through a ckraid. It only took load on two of the
DPTs (just one _seemed_ to work?), the mere presence of the third
was enough(?). It crashed with 2.1.107, 2.1.112 *and* 2.0.35
with both eata_dma and the Ballabio driver.
Took the Future Domain home and hammered it for hours. No problem.
Swapped it back in this morning and we have seeming stability back
(until I hammer the FD?).
I'll start rotating and hammering the DPTs this weekend but it
_looks_ like this could be something to do with hardware PCI
(multiple busmasters?) and, perhaps, patterns of access.
N.B. (Abit BX6 M/B, 2 x DPT 2044 (7G1 firmware), 1 x DPT 2044
(7H0 firmware).
Of course my home machine is a different M/B, slower processor
and the narrow SCSI drives I have available for test are less than
half the speed of the wide work drives...
>
> 1. Anybody using a Future Domain successfully? (later crashes may
> be _solely_ down to the FD)
No. It works.
> It is possible that both the Balles* EATA driver and the Future
> Domain driver have race conditions which break them eventually.
> However, my current feeling is that the race is higher level
> and loading four or five devices on two or three controllers
> just makes it more likely.
Latest hypothesis is that this one is a PCI problem - which probably
isn't exposed by the usual wimpy Windows tests :-).
Mike
-- .----------------------------------------------------------------------. | Mike Jagdis | Internet: mailto:mike@roan.co.uk | | Roan Technology Ltd. | | | 54A Peach Street, Wokingham | Telephone: +44 118 989 0403 | | RG40 1XG, ENGLAND | Fax: +44 118 989 1195 | `----------------------------------------------------------------------'--279709697-242958898-901885633=:13502 Content-Type: TEXT/PLAIN; charset=US-ASCII; name="scsi.patch" Content-Transfer-Encoding: BASE64 Content-ID: <Pine.LNX.3.91.980731124713.13502B@toaster.roan.co.uk> Content-Description: Fix SCSI wastage
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