I found some information about lower Krait performance when i bought DosBox Turbo, taken from FAQ
Why is DosBox Turbo running faster on Tegra & Samsung SoC's rather than on Qualcomm Snapdragon S4 (Krait)?
There are two reasons that users see better performance on Nvidia Tegra 3 and Samsung SoC's rather than the Qualcomm Snapdragon S4 SoC:
1. The stock ROM on most Krait devices (ie. Nexus 4 and the 2013 refresh of the Nexus 7) ship with the conservative ondemand governor which has trouble staying in a higher Mhz state when other apps are running, due to the high frequency at which most Krait SoC's ship.
2. The Qualcomm Snapdragon S4 series has poor integer & NEON IPC when running code with low ILP (ie. most emulators). Due to the poor Integer & NEON IPC, most emulators will suffer a performance hit on Snapdragon S4 series SoC's when compared to a standard Cortex A8/A9/A15. (reference: discussion in Qualcomm Developer Forum & latencies seen in compiled code).
[Snapdragon S4 SoC (ie. Nexus 4 & 2013 Nexus 7) Tip]: Significant performance gains can be realized on these devices by simply changing the governor to interactive and killing all running apps in memory before starting DosBox Turbo. Further performance gains be be realized by utilizing the Faux123 custom kernel.
More information here.:
https://sites.google.com/site/dosboxturbo/performance
Why is DosBox Turbo running faster on Tegra & Samsung SoC's rather than on Qualcomm Snapdragon S4 (Krait)?
There are two reasons that users see better performance on Nvidia Tegra 3 and Samsung SoC's rather than the Qualcomm Snapdragon S4 SoC:
1. The stock ROM on most Krait devices (ie. Nexus 4 and the 2013 refresh of the Nexus 7) ship with the conservative ondemand governor which has trouble staying in a higher Mhz state when other apps are running, due to the high frequency at which most Krait SoC's ship.
2. The Qualcomm Snapdragon S4 series has poor integer & NEON IPC when running code with low ILP (ie. most emulators). Due to the poor Integer & NEON IPC, most emulators will suffer a performance hit on Snapdragon S4 series SoC's when compared to a standard Cortex A8/A9/A15. (reference: discussion in Qualcomm Developer Forum & latencies seen in compiled code).
[Snapdragon S4 SoC (ie. Nexus 4 & 2013 Nexus 7) Tip]: Significant performance gains can be realized on these devices by simply changing the governor to interactive and killing all running apps in memory before starting DosBox Turbo. Further performance gains be be realized by utilizing the Faux123 custom kernel.
More information here.:
https://sites.google.com/site/dosboxturbo/performance
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