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Improvement of bootup time using Power Management - Project Update -

Improvement of bootup time using Power Management - Project Update -. Hiroki Kaminaga Sony Corporation kaminaga@sm.sony.co.jp [translated by ikoma@slab.tnr.sharpco.jp ]. Goal:. Want to shorten start up time of application. Processing until the application reaches to main()

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Improvement of bootup time using Power Management - Project Update -

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  1. Improvement of bootup time using Power Management- Project Update - Hiroki Kaminaga Sony Corporation kaminaga@sm.sony.co.jp [translated by ikoma@slab.tnr.sharpco.jp] JapanTechnicalJamboree5

  2. Goal: • Want to shorten start up time of application • Processing until the application reaches to main() • Transfer of image • Dynamic linking • Global constructors • IPC Processing among applications for the whole system running HW initialization Mounting drivers init Startup time of application (Boot loader / kernel) 1 [s] 1 [s] 2 [s] 5 [s] JapanTechnicalJamboree5

  3. Hibernation on Linux: • Swsusp • Included in 2.6 vanilla kernel(Documentation/power/swsusp.txt) • Author: Pavel Machek • Software Suspend 2 • http://www.suspend2.net/ • Author: Nigel Cunningham JapanTechnicalJamboree5

  4. Hibernation on Linux(Comparison): swsusp Suspend2 Source:http://www.suspend2.net/features JapanTechnicalJamboree5

  5. Current Status: • Ported Suspend2 onto ARM • Posted on Suspend2 ML • To be incorporated in next release! http://lists.suspend2.net/lurker/message/20051114.094040.11261d0e.en.html JapanTechnicalJamboree5

  6. Environment: • Target board • OMAP Starter Kit (OSK 5912) • OS • Linux 2.6 • Boot loader • U-boot • Image destination • Flash ROM Hardware Features: ARM9 core operating at 192 Mhz. DSP core operating at 192 Mhz. TLV320AIC23 Stereo Codec 32 Mbyte DDR SDRAM 32 Mbyte Flash ROM RS-232 Serial Port 10 MBPS Ethernet port USB Host Port Compact flash connector On board IEEE 1149.1 JTAG JapanTechnicalJamboree5

  7. Suspend2 Evaluation: • Linux 2.6.14 + Suspend2-2.2-rc9 • Hibernate from ash login state • Used printk time of kernel to measure time • Baseline is the timimg when linux starts up from uboot • In make menuconfig • Kernel hacking ---> [ ] Show timing information on printks • http://tree.celinuxforum.org/CelfPubWiki/PrintkTimes JapanTechnicalJamboree5

  8. Suspend2 Results: • Normal Start up • 7.618 [sec] • Suspend2 (lzf on) • 22.492 [sec] • 12.371 MB  7.450 MB (compression rate 39%) • Suspend2 (lzf off) • 17.99 [sec] Diff of startup time: 20%,4.50 [sec] Suspend2 process start at: 4.402 [sec] JapanTechnicalJamboree5

  9. swsusp Evaluation: • Linux 2.6.11 • Used printk time of kernel to measure time • Clock starts when linux starts up from uboot • In make menuconfig • Kernel hacking ---> [ ] Show timing information on printks • http://tree.celinuxforum.org/CelfPubWiki/PrintkTimes JapanTechnicalJamboree5

  10. swsusp Results: • Normal startup • 7.676 [sec] • swsusp (ash) • 9.52 [sec] • Image: 6.38 MB • swsusp (mplayer) • 13.910 [sec] • Image: 10.24 MB (swsusp process start at: 2.174 [sec]) JapanTechnicalJamboree5

  11. Swsusp/suspend2 Comparison: • Not a strict comparison as Linux versions are not the same… • Swsusp/linux2.6.11: image is small, and startup is fast • Suspend2/linux2.6.14: LZF compression of image is effective, but tradeoff with startup time • Suspend2-2.2 is not stable yet, as it is RC… JapanTechnicalJamboree5

  12. Swsusp/suspend2 Comparison: (cont.) • Image size/processing time • Suspend2: 925KB/sec • swsusp: 889KB/sec JapanTechnicalJamboree5

  13. Swsusp3: • Author of swsusp, Pavel, has extended swsusp with encryption, compression, UI etc. • The goal is to minimize the change to kernel by most of processing done in the user land • http://lists.osdl.org/pipermail/linux-pm/2005-September/001312.html • http://lists.osdl.org/pipermail/linux-pm/2005-November/001535.html • http://lists.osdl.org/pipermail/linux-pm/2005-November/001562.html JapanTechnicalJamboree5

  14. Swsusp3: (ML digests) • Want to integrate kernel part into around 2.6.16 (Pavel) • If integrated, RH/FC kernel would fork. Swsusp3 uses /dev/mem, but they restrict /dev/mem to prevent rootkit (Dave Jones) …(hot discussion continues on swsusp3 vs security) • Encryption/compression in userland is more intuitive (Rafael J. Wysocki ) JapanTechnicalJamboree5

  15. Swsusp3: (ML digests (cont.)) • Those functions are already in suspend2. Duplicated effort (Dumitru Ciobarcianu ) • It is different to implement in kernel. Can’t believe Pavel? Nigel knows what he should do to work together. (Greg K-H) • I can’t understand why they think userland is the right place. (Nigel) JapanTechnicalJamboree5

  16. Swsusp3: (ML digests (cont.)) • Userland swsusp changes only 150 lines or so in kernel (Pavel) • Present Nigel’s code won’t be mainlined. (Greg K-H) • (Hot discussion continues) JapanTechnicalJamboree5

  17. EOF JapanTechnicalJamboree5

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