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Hello,
I thought I'd poke about with the eMMC in the Galaxy S4 which I have
here to see if it supported a sufficient number of AUs to be worth
switching to f2fs (I believe you need 7 simultaneous AUs minimum?).
Had a go at determining AUs, but I don't think I'm seeing any
performance drop-off, but not sure if I'm doing something wrong?
Cheers,
Tim.
root@localhost:/# cd /sys/block/mmcblk0/device/ && grep ^ * 2> /dev/null
caps:0x40080f4e
caps2:0x00031927
cid:110100303136473934b0d49cac223006
csd:d00e00320f5903ffffffffff92400024
date:03/1997
enhanced_area_offset:18446744073709551594
enhanced_area_size:4294967274
erase_size:4194304
erase_type:MMC_CAP_ERASE enabled, type DISCARD, SECURE supportable,
Sanitize enabled
fwdate:0x0000000000000000
fwrev:0x0
hwrev:0x0
manfid:0x000011
name:016G94
oemid:0x0100
preferred_erase_size:4194304
serial:0xd49cac22
smart:0x0000000000000000
type:MMC
uevent:DRIVER=mmcblk
uevent:MMC_TYPE=MMC
uevent:MMC_NAME=016G94
uevent:MODALIAS=mmc:block
root@localhost:/# flashbench -a /dev/block/mmcblk0
align 4294967296 pre 458µs on 523µs post 484µs diff 52.3µs
align 2147483648 pre 445µs on 580µs post 501µs diff 107µs
align 1073741824 pre 436µs on 549µs post 488µs diff 87.2µs
align 536870912 pre 419µs on 475µs post 445µs diff 43.6µs
align 268435456 pre 436µs on 497µs post 453µs diff 52.3µs
align 134217728 pre 471µs on 549µs post 532µs diff 48µs
align 67108864 pre 532µs on 562µs post 541µs diff 26.2µs
align 33554432 pre 510µs on 593µs post 549µs diff 63.2µs
align 16777216 pre 645µs on 724µs post 680µs diff 61µs
align 8388608 pre 637µs on 702µs post 663µs diff 52.3µs
align 4194304 pre 767µs on 859µs post 798µs diff 76.3µs
align 2097152 pre 776µs on 841µs post 802µs diff 52.3µs
align 1048576 pre 772µs on 846µs post 798µs diff 61µs
align 524288 pre 776µs on 824µs post 811µs diff 30.5µs
align 262144 pre 789µs on 793µs post 785µs diff 6.54µs
align 131072 pre 789µs on 802µs post 793µs diff 10.9µs
align 65536 pre 802µs on 802µs post 802µs diff 0ns
align 32768 pre 824µs on 820µs post 793µs diff 10.9µs
root@localhost:~# gdisk -l /dev/block/mmcblk0 | egrep '^(Num| 18)'
Number Start (sector) End (sector) Size Code Name
18 5894728 10134087 2.0 GiB 8300 cache
# since I only want to operate on this partition, I'll manually round up
# the start offset of this partition to hit the first erase block (4M
# according to the card) which is in side the start of the partition.
root@localhost:/# flashbench /dev/block/mmcblk0p18 --offset 1798144
--open-au --erasesize=$[4 * 1024 * 1024] --blocksize=$[256 * 1024]
--open-au-nr=2
4MiB 26.8M/s
2MiB 25.8M/s
1MiB 25.1M/s
512KiB 23.5M/s
256KiB 20.5M/s
root@localhost:/# flashbench /dev/block/mmcblk0p18 --offset 1798144
--open-au --erasesize=$[4 * 1024 * 1024] --blocksize=$[256 * 1024]
--open-au-nr=64
4MiB 24.7M/s
2MiB 25.2M/s
1MiB 25.2M/s
512KiB 24.1M/s
256KiB 20M/s
root@localhost:~# flashbench /dev/block/mmcblk0p18 --offset 1798144
--open-au --random --erasesize=$[4 * 1024 * 1024] --blocksize=$[16 *
1024] --open-au-nr=2
4MiB 23.8M/s
2MiB 26.2M/s
1MiB 25M/s
512KiB 24.8M/s
256KiB 19.8M/s
128KiB 15.4M/s
64KiB 11.9M/s
32KiB 13.1M/s
16KiB 9.51M/s
root@localhost:~# flashbench /dev/block/mmcblk0p18 --offset 1798144
--open-au --random --erasesize=$[4 * 1024 * 1024] --blocksize=$[16 *
1024] --open-au-nr=33
4MiB 24.9M/s
2MiB 25.8M/s
1MiB 25.2M/s
512KiB 24.5M/s
256KiB 20M/s
128KiB 15.1M/s
64KiB 11.5M/s
32KiB 12.1M/s
16KiB 8.48M/s
root@localhost:~# flashbench /dev/block/mmcblk0p18 --offset 1798144
--open-au --random --erasesize=$[4 * 1024 * 1024] --blocksize=$[16 *
1024] --open-au-nr=65
4MiB 22.2M/s
2MiB 25.9M/s
1MiB 25.4M/s
512KiB 24.3M/s
256KiB 20.4M/s
128KiB 15.7M/s
64KiB 11.8M/s
32KiB 12.6M/s
16KiB 8.68M/s
root@localhost:~# flashbench /dev/block/mmcblk0p18 --offset 1798144
--open-au --random --erasesize=$[4 * 1024 * 1024] --blocksize=$[16 *
1024] --open-au-nr=1
4MiB 15.8M/s
2MiB 24.1M/s
1MiB 26.4M/s
512KiB 24.3M/s
256KiB 19.3M/s
128KiB 16M/s
64KiB 12M/s
32KiB 13.1M/s
16KiB 9.92M/s
# ... not really sure how to interpret that. Am I wrong in attempting
# to just operate on the partition, with that offset?
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邀请函
------------------ 原始邮件 ------------------
发件人: "林梓国";<rwrtroq(a)mcmcarch.com>;
发送时间: 2016-8-15(星期一) 上午23:36:18
收件人: "flashbench-results"<flashbench-results(a)lists.linaro.org>;
主题: 转发:《生产计划与物料控制PMC实务》邀请函
详细信息参考附件资料
发件人: 林梓国
发送时间: 2016年8月15日 9:49
收件人: flashbench-results
主题: 《生产计划与物料控制PMC实务》邀请函
保密公告(CONFIDENTIALITY NOTICE): 本邮件仅为指定之个人或实体所使用,可能包含有保密信息、受特殊保护信息或为适用法律豁免披露的信息。若此邮件的读者非指定收件人,我们特此通知您请勿打印、复制、发布、散发、转发本邮件。如果此邮件误送于您,请立即联系发件人,并立即从系统中删除。谢谢。(This e-mail is intended for the use of the individual or entity to which it is addressed and may contain information that is confidential, privileged and exempt from disclosure under applicable law. If the reader of this e-mail is not the intended recipient, you are hereby notified that any printing, copying, dissemination, distribution, disclosure or forwarding of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and delete it from your system. Thank You.)
填写附件完成报名
------------------ 原始邮件 ------------------
发件人: "甄经理";<anw(a)gxmama.net>;
发送时间: 2016-8-3(星期三) 上午8:23:02
收件人: "flashbench-results"<flashbench-results(a)lists.linaro.org>;
主题: 转发:研发管理报名回执
附件资料请查阅
发件人: hr
发送时间: 2016年8月2日 9:49
收件人: flashbench-results
抄送: 陈生
主题: 研发管理报名回执
研发部门如何提高工作效率的管理探讨
一、 组织协同,避免缺乏组织,让事情放任自流,一盘散沙,这是产品日常管理责任人、项目负责人的责任。
二、 难点问题即时支援攻克,避免员工工作粘滞影响进度。
三、 经验不断总结并标准化,避免低水平重复工作。
四、 立项严谨,避免折腾。
五、 我们需要一支有原则的队伍,“我要什么时间完成这个工作,你必须何时提供这个东西给我,有问题请你和你的上司商量,这个问题请尽快办!”避免老好人、避免漫无目的、避免无原则,到头来才说是别人没按时给你。
六、 有困难立即找上级协助解决,面谈、打电话、邮件都可以。
七、 “举手制”——变更必须沟通协调,避免不沟通导致的失误和损失,我们就像一架奔跑的四马拉的战车,任何一匹马要改变方向或者速度,都会带来其余三匹马的问题。
八、 我们必须是一个全能型的精灵,我们处在一个高度讲求效率和快速反应的行业里,反应要快,要能坚持。
九、 产品风险大,必须严谨、再严谨,防呆、放错、多方验证必须是每个工程师的基本认识。
十、 “我们是一伙的”——我们还处在需要快速成长的阶段,我们的产品积累不够,产品线不完善,还不能完全覆盖所有客户的各种需求,应客户需求进行开发的事情较多,一边沟通了解、一边设计、一边生产,交货时间紧迫。这类特征要求我们必须是一个高度讲求效率、高度讲求沟通协调,高度讲求工作质量、高度讲求一次就尽力把事情做好的组织。
十一、 持续改善提高,不断完善和总结。
保密公告(CONFIDENTIALITY NOTICE): 本邮件仅为指定之个人或实体所使用,可能包含有保密信息、受特殊保护信息或为适用法律豁免披露的信息。若此邮件的读者非指定收件人,我们特此通知您请勿打印、复制、发布、散发、转发本邮件。如果此邮件误送于您,请立即联系发件人,并立即从系统中删除。谢谢。(This e-mail is intended for the use of the individual or entity to which it is addressed and may contain information that is confidential, privileged and exempt from disclosure under applicable law. If the reader of this e-mail is not the intended recipient, you are hereby notified that any printing, copying, dissemination, distribution, disclosure or forwarding of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and delete it from your system. Thank You.)