On Sun, Oct 14, 2018 at 3:52 AM Christoph Hellwig <h...@lst.de> wrote:
>
> We already build the swiotlb code for 32b-t kernels with PAE support,
> but the code to actually use swiotlb has only been enabled for 64-bit
> kernel for an unknown reason.
>
> Before Linux 4.18 we papers over this fact because the networking code,
> the scsi layer and some random block drivers implenented their own
> bounce buffering scheme.
>
> Fixes: 21e07dba ("scsi: reduce use of block bounce buffers")
> Fixes: ab74cfeb ("net: remove the PCI_DMA_BUS_IS_PHYS check in
> illegal_highdma")
> Reported-by: tedheadster <tedheads...@gmail.com>
> Tested-by: tedheadster <tedheads...@gmail.com>
> ---
>
Christoph,
this fix has causes performance to decrease dramatically. Kernel
builds that used to take 10-15 minutes are now taking 45-60 minutes on
the same machine.
- Matthew Whitehead
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