Continuing my SiliconExpress experimentation, I've been doing some benchmarks on my Quadra 650 board with ZuluSCSI.
Read
Write results are generally ~30% slower.
I need to try the SCSI 4.3 firmware to see if it's any different.
Wombat boards have a NuBus implementation that leaves a bit to be desired (no double data rate transfers @ 20MHz except between cards), which TIL 9305 implies should give you 8-10MB/s to the logic board and a theoretical 20MB/s out of the logic board (if the destination device could accept block transfers at zero wait). So that seems ballpark to what we're getting.
Still, surprisingly rough! So it seems on the earlier Quadras there's only a small boost from moving to 16-bit (~10%).
The official documentation always seemed ambiguous to me if later devices really supported 20MHz transfers to the logic board. Has anyone benchmarked a Quadra AV or 6100/7100/8100 and a SiliconExpress?
Read
| Native SCSI | ZuluSCSI (RP2040) | 4,700KB/s |
| SiliconExpress IV (8-bit) - 1.6.5 | ZuluSCSI (RP2040) | 8,123KB/s |
| SiliconExpress IV (16-bit) - 1.6.5 | ZuluSCSI Wide | 8,959KB/s |
I need to try the SCSI 4.3 firmware to see if it's any different.
Wombat boards have a NuBus implementation that leaves a bit to be desired (no double data rate transfers @ 20MHz except between cards), which TIL 9305 implies should give you 8-10MB/s to the logic board and a theoretical 20MB/s out of the logic board (if the destination device could accept block transfers at zero wait). So that seems ballpark to what we're getting.
Still, surprisingly rough! So it seems on the earlier Quadras there's only a small boost from moving to 16-bit (~10%).
The official documentation always seemed ambiguous to me if later devices really supported 20MHz transfers to the logic board. Has anyone benchmarked a Quadra AV or 6100/7100/8100 and a SiliconExpress?
