Hello Sudhakar, On Fri, Jan 27, 2012 at 08:11:55AM +0000, Rajashekhara, Sudhakar wrote: > I tested both these patches and they work fine on the OMAP-L138 EVM. I > observed that with these patches the number of interrupts during a transfer > are less compared to earlier. For a 100 MB transfer, I could see around > 700-800 interrupts less. Did you see any performance improvement with these > patches?
Thanks for testing these. The difference in the number of interrupts, or rather the ratio, depends on the scenario you're working on. The spurious patch has an effect on non-dma transfers, while the polling optimization affects small (i.e. up to 128 bytes) transactions. I expect these to have a greater impact on SDIO scenarios than on SD scenarios. Regarding the performance improvement, these patches were tested using a WLAN SDIO adapter, which requires quite a few small transactions. The polling optimization had an impact of around 10-15% in throughput. The spurious patch did not have any noticeable effect on throughput, but did lower the number of interrupts by up to 25% in some cases. Thanks, Ido. -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
