[Qemu-devel] Re: [PATCH 4/8] ahci: use qiov instead of dma helpers

2011-01-18 Thread Kevin Wolf
Am 18.01.2011 14:14, schrieb Stefan Hajnoczi: > On Tue, Jan 18, 2011 at 01:45:40PM +0100, Alexander Graf wrote: >> >> On 18.01.2011, at 13:35, Kevin Wolf wrote: >> >>> Am 20.12.2010 22:13, schrieb Alexander Graf: The DMA helpers incur additional overhead on data transfers. I'm not sure we

[Qemu-devel] Re: [PATCH 4/8] ahci: use qiov instead of dma helpers

2011-01-18 Thread Stefan Hajnoczi
On Tue, Jan 18, 2011 at 01:45:40PM +0100, Alexander Graf wrote: > > On 18.01.2011, at 13:35, Kevin Wolf wrote: > > > Am 20.12.2010 22:13, schrieb Alexander Graf: > >> The DMA helpers incur additional overhead on data transfers. I'm not > >> sure we need the additional complexity provided by them.

[Qemu-devel] Re: [PATCH 4/8] ahci: use qiov instead of dma helpers

2011-01-18 Thread Alexander Graf
On 18.01.2011, at 13:35, Kevin Wolf wrote: > Am 20.12.2010 22:13, schrieb Alexander Graf: >> The DMA helpers incur additional overhead on data transfers. I'm not >> sure we need the additional complexity provided by them. So let's just >> use qiovs directly when running in the fast path (ncq). >>

[Qemu-devel] Re: [PATCH 4/8] ahci: use qiov instead of dma helpers

2011-01-18 Thread Kevin Wolf
Am 20.12.2010 22:13, schrieb Alexander Graf: > The DMA helpers incur additional overhead on data transfers. I'm not > sure we need the additional complexity provided by them. So let's just > use qiovs directly when running in the fast path (ncq). > > Signed-off-by: Alexander Graf > --- > hw/ide/