[Linux-ia64] IA64 Linux issues

[Linux-ia64] IA64 Linux issues

[Van Maren, Kevin]

I'm running Caldera's 6/20/01 snapshot (modified 2.4.4 kernel) on a 4X,
8GB Lion.

Under even "light" I/O load (mkfs to 2-4 disks) I get horiffic behavior --
basically what is described on this thread:
http://www.cs.helsinki.fi/linux/linux-kernel/2001-20/0763.html
[I/O drops down to < 300 I/Os per second (vmstat), but all the CPUs are
pegged 99%+ system time.]

That is after I first used "swiotlb\x10240" at elilo to avoid the panic,
and then hacked the qlogicfc driver (patch at bottom) and applied the
latest Adaptec driver patch (6.2.0) from freebsd.org to get 39-bit DMA.
Problem occurs with 39160 & QL2200.

I tried upgrading to 2.4.7+IA64-010726, but when I did that, "init" dies:
  init[1]: IA-64 Illegal operation fault 0
[...]
  Kernel panic: Attempted to kill init!

So i tried 2.4.5+IA64-010626.  Once I fixed two bugs in smp.c that prevented
compilation, it seemed to work.  Except that the I/O peformance was just as
bad.



qlogicfc.c patch:
doesn't do this in 2.4.7, which seems odd, since the driver *appears*
to support 64-bit DMA.

Anyway, with the following patch I appear to get 64-bit DMA enabled (at
least I don't get a panic on the 8GB IA-64 box running QL2200 cards w/o
tweaking the swiotlb array size).

--- qlogicfc.c.orig
+++ qlogicfc.c
@@ -2079,6 +2079,9 @@ static int isp2x00_init(struct Scsi_Host
        sh->irq = irq;
        sh->io_port = io_base;

+       if (pci_set_dma_mask(pdev, (dma_addr_t) 0xFFFFffffFFFFffffUL))
+               printk("qlogicfc%d: Failed to update dma_mask\n",
+                       hostdata->host_id);
        LEAVE("isp2x00_init");

        return 0;

Re: [Linux-ia64] IA64 Linux issues

[Jes Sorensen]

>>>>> "Van" = Van Maren, Kevin <kevin.vanmaren@unisys.com> writes:

Van> I'm running Caldera's 6/20/01 snapshot (modified 2.4.4 kernel) on
Van> a 4X, 8GB Lion.

Van> Under even "light" I/O load (mkfs to 2-4 disks) I get horiffic
Van> behavior -- basically what is described on this thread:
Van> http://www.cs.helsinki.fi/linux/linux-kernel/2001-20/0763.html
Van> [I/O drops down to < 300 I/Os per second (vmstat), but all the
Van> CPUs are pegged 99%+ system time.]

Van> That is after I first used "swiotlb\x10240" at elilo to avoid the
Van> panic, and then hacked the qlogicfc driver (patch at bottom) and
Van> applied the latest Adaptec driver patch (6.2.0) from freebsd.org
Van> to get 39-bit DMA.  Problem occurs with 39160 & QL2200.

I'd stay away from the qlogicfc.c driver, it's got all sorts of
limitations.

Jes

RE: [Linux-ia64] IA64 Linux issues

[Van Maren, Kevin]

>
> I'd stay away from the qlogicfc.c driver, it's got all sorts of
> limitations.
>
> Jes

Could you be more specific?  I have problems with the Adaptec
as well (even after using the version with 39-bit DMA), and it
[horrific I/O performance] doesn't appear to be a driver issue.

Kevin

Re: [Linux-ia64] IA64 Linux issues

[Jes Sorensen]

>>>>> "Van" = Van Maren, Kevin <kevin.vanmaren@unisys.com> writes:

>>  I'd stay away from the qlogicfc.c driver, it's got all sorts of
>> limitations.
>> 
>> Jes

Van> Could you be more specific?  I have problems with the Adaptec as
Van> well (even after using the version with 39-bit DMA), and it
Van> [horrific I/O performance] doesn't appear to be a driver issue.

I can't remember all the details, but it includes bad error handling,
interrupt handling, lack of functionality.

Jes