kern/32338: Network to disk write performance low under ATA with DMA

David S. Madole david at
Wed Aug 25 14:04:47 PDT 2004

From: "Tilman Linneweh" <arved at>
> Synopsis: Network to disk write performance low under ATA with DMA
> State-Changed-From-To: open->feedback
> State-Changed-By: arved
> State-Changed-When: Wed Aug 25 20:45:41 GMT 2004
> State-Changed-Why:
> In the last two years several changes were committed to the sis driver.
> Did you test with a recent version of FreeBSD if your problem is fixed?

I don't know, as I no longer have a machine running day-to-day that is a
good test case.

After submitting this, I resigned to the fact that no one was interested,
probably rightly so, as the driver is probably not the best place to fix
what is really a BIOS PCI bus initialization issue, although there were
other drivers, at the time at least, that did this, too.

I maintained a local kernel patch for a little while, then realized it's
really just as easy to do something like

     pciconf -w -b pci0:9:0 0xd 0x60

if rc.local, and that's what I did for a long time. In the last few
months I have upgraded the machine that was the test case for this and it
now has an Intel NIC.


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