On Mon, May 2, 2016 at 12:22 PM, Ed Bartosh <ed.bart...@linux.intel.com> wrote:
> Hi, > > This patchset adds ability to use bmaptool to flash images faster than > using traditional methods. It contains bmap-tools recipe and generation > of .bmap files for the images generated by bitbake and wic. > > Bmaptool is a generic tool for creating the block map (bmap) for a file > and and copying files using the block map. The idea is that large file > containing unused blocks, like raw system image files, can be copied or > flashed a lot faster with bmaptool than with traditional tools like > "dd" or "cp". > > Here is an example of flashing image using dd and bmaptool showing > around 25% performance gain in flashing time: > > > ls -slh > 19M -rw-r--r-- 1 ed ed 26M Apr 26 11:36 > core-image-minimal-qemux86-64-20160426083554.rootfs.ext4 > 4.0K -rw-r--r-- 1 ed ed 2.7K Apr 26 11:36 > core-image-minimal-qemux86-64-20160426083554.rootfs.ext4.bmap > > > time dd if=core-image-minimal-qemux86-64-20160426083554.rootfs.ext4 > of=/dev/sdb > 52302+0 records in > 52302+0 records out > 26778624 bytes (27 MB) copied, 2.51183 s, 10.7 MB/s > > real 0m2.515s > user 0m0.014s > sys 0m0.329s > > > time bmaptool copy > core-image-minimal-qemux86-64-20160426083554.rootfs.ext4 /dev/sdb > bmaptool: info: discovered bmap file > 'core-image-minimal-qemux86-64-20160426083554.rootfs.ext4.bmap' > bmaptool: info: block map format version 2.0 > bmaptool: info: 6538 blocks of size 4096 (25.5 MiB), mapped 4799 blocks > (18.7 MiB or 73.4%) > bmaptool: info: copying image > 'core-image-minimal-qemux86-64-20160426083554.rootfs.ext4' to block device > '/dev/sdb' using bmap file > 'core-image-minimal-qemux86-64-20160426083554.rootfs.ext4.bmap' > bmaptool: info: 100% copied > bmaptool: info: synchronizing '/dev/sdb' > bmaptool: info: copying time: 1.8s, copying speed 10.3 MiB/sec > > real 0m1.909s > user 0m0.226s > sys 0m0.052s > > The test was repeated 5 times with the same image and the same usb stick > device. > > Changes in v2: Combined Alexander's and my bmap-tools recipes. > Got rid of generating standalone script as it breaks build > of bmap-tools-native. > > Changes in v3: Returned back generation of standalone bmaptool script > Implemented --bmap option for wic > Added test case to test bmap generation by wic --bmap I just wanted to say, this + the sparseness series is just awesome. Such a timesaver in my test cycle, particularly on my old macbook which has a usb 2.0 sd card reader :) -- Christopher Larson clarson at kergoth dot com Founder - BitBake, OpenEmbedded, OpenZaurus Maintainer - Tslib Senior Software Engineer, Mentor Graphics
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