See my comments inline: On Wednesday 26 April 2006 18:24, Martin, Tim wrote: > Gerhard, > > Thanks for the information. More questions... > > What type of transfers were you doing? (e.g. A32/D64? SST320 or SST267?) A32/D64 and 2eSST @ SST320
> Are these transfer from userspace data, from kernelspace data, or from > the Tundra's pattern buffer? They are from userspace. > What was your PCI bus speed & width? ??? > Were you using inbound/outbound windows or Tundra's DMA controller? DMA - via /dev/vme_dma0 interface > What was the Tundra chipset configuration for the 168 MBps? i.e. Buffersize 64K, 4K alignment, 2K PCI Fifo and 1K VME Fifo. Using the Tundra driver and its interface structure, I used a request level of 2, fairmode is set to normal, timeon timeout timer is set to 7 and timeoff is set to no waiting (0). > > Thanks, > Tim > > > -----Original Message----- > > From: linuxppc-embedded-bounces+tmartin=viasat.com at ozlabs.org > > [mailto:linuxppc-embedded-bounces+tmartin=viasat.com at ozlabs.org] On > Behalf > > Of Gerhard Jaeger > > Sent: Wednesday, April 26, 2006 12:26 AM > > To: linuxppc-embedded at ozlabs.org > > Subject: Re: PPC Linux support for Tundra TSI148 > > > > On Wednesday 26 April 2006 01:47, Martin, Tim wrote: > > > Does anyone out there have any real world measured performance of a > > > Linux PowerPC (kernel module + user space application) doing 2eSST > VME > > > transfers with the Tundra TSI148 chipset? > > > > > > Tundra has a Linux driver available for the Motorola MVME6100 , but > told > > > me they don't have any performance data available. I'm looking for > > > sustained throughput rates, not the peak burst rates (e.g. 320 MBps, > 267 > > > MBps). > > > > > > > Hi, > > > > I've done here some tests between two MVME6100, while updating the > 6100 > > BSP > > for our embedded Linux distro. Depending on the buffersize, alignment, > VME > > and > > PCI FIFO settings we have (without further optimizations) throughput > rates > > ranging > > from 100MBps up to 168MBps. I think some tuning could still be done. > > > >HTH > > Gerhard -- Gerhard Jaeger <gjaeger at sysgo.com> SYSGO AG Embedded and Real-Time Software www.sysgo.com | www.elinos.com | www.pikeos.com | www.osek.de