新款MacBook Air还不错

bulaohu

OK，大家都以这篇文章为准吧

http://www.informationweek.com/n ... l?articleID=6503205

They're all descriptive terms for varying levels of power management on a PC, but the reason it's confusing is that what one vendor calls "sleep" another may call "standby." Or, even more confusingly, different vendors may both use the same term to mean very different power states.
But things become clearer when you substitute industry-standard terms in place of the descriptive English words. For example, most PCs today support six distinct power modes, or "sleep states," commonly defined as S0 through S5.

You can see the logic of the naming convention if you think of S0 as "sleep state zero," or "sleep zero"; in other words, no sleep at all. In fact, S0 is indeed a system's normal full-power state, or what we'd usually simply call "on." Modes S1-S4 offer increasing levels of power savings, which we'll fully explore in a moment. S5 is the highest power-savings mode, representing a complete power-off such as that achieved by a shut down command.

OK, S0 and S5--on and off--are pretty obvious, but what about the states in between?

S1, S2, and S3 all are low-power, energy-saving states from which the PC can be awakened by jiggling the mouse or tapping a key. (Other external events, such as a special kind of LAN packet or an inbound modem call, also can trigger a wake-up, depending on how the system is set up.) When the PC awakens, it picks up from where it left off when the low-power mode kicked in--the same files will be open, the same apps will be running, etc.
Beyond this broad similarity, the three modes differ:

S1 is the simplest energy-saving state, often used in older systems whose drivers or hardware won't behave well with more sophisticated levels of power management. A system at the S1 power level simply shuts down the hard drive(s) and monitor, but leaves everything else running normally. Different vendors call S1 by different names, but sleep or standby are perhaps the most common.

S2 offers greater power savings because it not only powers down the monitor and drives, it also cuts power to the CPU and its cache. Confusingly, this level also is sometimes called sleep or standby.

S3 is a deeper power-savings mode that shuts down almost everything except for the barest trickle of power needed to keep the contents of RAM from fading away and to listen for a wake-up action. In a way, you can think of S3 as a "suspend to RAM" state. In fact, many vendors do refer to S3 as "suspend" mode, but others (alas) may call it standby, sleep, instant on, on now, and the like.

Note that, although states S1, S2, and S3 all save energy compared with a full-on PC, they still need at least a trickle of electricity to enable the PC to watch for a wake-up event, and to preserve the contents of RAM. That's a key point: If your PC loses power while it's in mode S1, S2, or S3, any information held in RAM--for example, open and unsaved documents or files--will be lost or damaged.

Level S4 is fundamentally different from levels S1 to S3. It's hibernation, where the system stops all activity, just as if you had shut it off. But S4 is also different from the simple power-off of level S5 because, before powering down, the S4 hibernation system writes the contents of RAM and some CPU settings to a special file on your hard drive (often called something like "hiberfil.sys"). Because the PC is truly off--drawing no power--it can't watch for a key press or mouse movement to wake up; you usually have to hit the power switch to bring the system out of hibernation. But when the PC awakens from hibernation, it doesn't have to go through a full reboot. Instead, it reads the contents of the hibernation file back into memory, and thus restores itself to the exact same condition it was in when hibernation started. Although this takes longer than waking from a sleep or standby or suspend mode, it's usually much faster than a full boot. Plus, because the PC is truly off during hibernation, there's nothing live in RAM, so a power failure will have no effect on the system because all the normally volatile information in the system is safely stored in the hibernation file on your hard drive.

Although S0 through S5 are the main power states we need to consider, to be technically complete I should point out that there are actually more power states and variations for different components or situations, depending on (for example) whether a system is powered off mechanically or by software such as in a "warm reboot." All these power states are defined in the industry-standard Advanced Configuration and Power Interface specification, developed by Compaq, Intel, Microsoft, Phoenix, and Toshiba. It's a published spec, and you can read it online at the ACPI consortium's home page. Two of the original collaborators of the ACPI spec--Microsoft and Intel--also have excellent ACPI information online.

bulaohu

Power-Management Problems
The current ACPI general specification (version 2.0) is only about 2 years old, and it's still evolving. The last revision--2.0a--was released in March. It's actually a well-thought-out and well-supported spec whose overall intent is to define a way in which all the hardware and software on a system can communicate and interact with regard to their current power states, needs, and abilities. One familiar example of this interaction is the "intelligent" power switch found on most new PCs: When the PC is on, pressing the nominal "power" switch doesn't simply kill the power; rather, it sends a signal through ACPI to the operating system, which then initiates a controlled shutdown. With ACPI, an operating system may even let you assign different functions--sleep, suspend, hibernate, off--to the power switch.
Most newer systems, add-on devices, and operating systems support the current ACPI spec and thus offer excellent power control. They can, for example, shut down to any of several low-power or power-off modes, then resume operation without difficulty.
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But older systems may not handle power-management tasks so gracefully, and here's why: ACPI replaced an older, less-versatile Advanced Power Management spec, which basically just put the BIOS in control of power management. This is fundamentally different from ACPI, so hardware and software designed for APM may not work well with ACPI, and vice versa.
If the computer industry had made a clean break from APM, things might have worked more smoothly, but that's not how it went. For several years in the mid- to late 1990s, APM and ACPI were both in wide play. As a result, it was not at all uncommon for a given system to have an operating system, a system BIOS, and hardware drivers that might be designed either for different power-management standards or different versions of the same standard.
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What's more, the old APM spec was never very good to begin with, and the initial versions of ACPI also had rough edges that sometimes prevented systems from living up to their power-management potential.
In short, for several years, power management was a mess. This is one reason power-management problems (including Windows' infamous "hang on shutdown" glitch) are so common in systems more than a couple of years old.
(By the way: The permanent fix for that type of problem usually involves getting current drivers for all add-on hardware and updating your system BIOS. See, for example, How To Troubleshoot Windows 98 Shutdown Problems. Or check out the many third-party sites with information on solving shutdown problems here. Microsoft also has archival information on the now-obsolete APM spec that may be useful if you're struggling with power management on older, APM-era hardware.)
Fortunately, the current ACPI spec makes most of this moot: If your operating system, BIOS, and device drivers all support the current ACPI 2.0 spec, odds are power management will work as it should on your system.
Adjusting The Sleep/Power States
If your system supports the current ACPI spec, you may be able to attain very high levels of energy savings by either or both of two methods: First, see what operating-system-level power-management options are available to you. For example, in Windows, open Control Panel, click on the Power applet, and explore your choices.
Your PC's BIOS may also offer secondary adjustments. For example, some BIOS setup utilities let you assign a default ACPI power setting to be used whenever the operating system calls for a sleep mode. I have a system with an Award BIOS, for instance, that lets me specify either the S1 or S3 sleep modes (see above). By choosing S3, I can ensure greater energy savings. Conversely, if my system experiences trouble going into or recovering from the "deep sleep" of S3, I could use S1 to achieve greater stability, albeit with lesser energy savings. To access your BIOS setup, watch your screen at startup for instructions: Usually, you must press a key--the "Del" key is commonly used--before you hear the system beep. If you can't find a way into your BIOS setup, visit your system vendor's Web site for information.
The exact power-management choices open to you will depend on the specifics of your hardware and software, but here are some links to get you started:
A feature article called Power Management In The Corporate Network (Win2K/XP) offers good, practical implementation advice on ACPI systems.
Microsoft offers Windows users a large amount of operating-system-specific power-management information for WinXP, Win2000, Win98, WinME, and Win95.
Users running Linux on Intel- or AMD-type hardware can obtain tons of ACPI information here.
Once you know the choices available to you, you can make better use of them, saving energy--and money--in the process!
What are your power-management experiences, tips, and tricks? Join the Listening Post discussion at http://www.informationweek.com/forum/fredlanga

大饼

原帖由 bulaohu 于 2010-10-27 13:06 发表
我不知道116楼说的是啥

同问。

yuba

XP确实有standby，哪位点一下试试，看看硬盘是否还转

大饼

S3模式下除了内存的刷新电路还在工作，以保持内存里的东西。其他所有的东西包括硬盘统统关掉。
通常S3和关机的时候笔记本主板上会有一颗低功耗的弹片机（mac book air用的是瑞萨的H8S系列）来管理电源/电池，开关等一些仍保持工作的东西。

matri

完全不是一回事，apple那个必须硬件配合，传统stanby仍然要保留内存供电，这样不管什么机器，待机都不会超过一周，你随便找个本子来试试就知道了，air这个待机30天，那是更深层次睡眠了。

bulaohu

原帖由 yuba 于 2010-10-27 13:19 发表
XP确实有standby，哪位点一下试试，看看硬盘是否还转

322733

如果只有stand by和shutdown的话，standby跟sleep应该是同义词?

大饼

原帖由 yuba 于 2010-10-27 13:19 发表
XP确实有standby，哪位点一下试试，看看硬盘是否还转

322733

当然不转的。sata的供电都给掐了。我n个月前就测量过了。
那些个说standby的时候硬盘还砖的，估计是电脑的电源设计不符合规范

大饼

原帖由 matri 于 2010-10-27 13:29 发表
完全不是一回事，apple那个必须硬件配合，传统stanby仍然要保留内存供电，这样不管什么机器，待机都不会超过一周，你随便找个本子来试试就知道了，air这个待机30天，那是更深层次睡眠了。 ...

air如果是2秒以内唤醒的话，肯定是standby。如果suspend到SSD硬盘的话，你算算需要多少秒才能把数据从硬盘读到内存里？

bulaohu

原帖由 大饼 于 2010-10-27 13:38 发表

当然不转的。sata的供电都给掐了。我n个月前就测量过了。
那些个说standby的时候硬盘还砖的，估计是电脑的电源设计不符合规范

而且hibernate恢复的时候一样要先经过POST和硬件检测的，然后OS会发现硬盘上有page file，然后就会load到内存，除了这一步，其他的跟关机状态开机完全一样

大饼

原帖由 bulaohu 于 2010-10-27 13:50 发表


而且hibernate恢复的时候一样要先经过POST和硬件检测的，然后OS会发现硬盘上有page file，然后就会load到内存，除了这一步，其他的跟关机状态开机完全一样 ...

对于硬件来说hibernate 就等于 关机。

yuba

原帖由 大饼 于 2010-10-27 13:38 发表
当然不转的。sata的供电都给掐了。

别以为供电掐了就不转了，梦游中啥事儿都可能发生

orange0328

好漂亮不过蛮花瓶的。有那钱上个上网本省下钱能买个镜头了。。

chenyi1976

原帖由 orange0328 于 2010-10-27 14:02 发表
好漂亮不过蛮花瓶的。有那钱上个上网本省下钱能买个镜头了。。

镜头更浮云啊，一块玻璃就买那么贵。。。

：）

matri

原帖由 大饼 于 2010-10-27 13:43 发表

air如果是2秒以内唤醒的话，肯定是standby。如果suspend到SSD硬盘的话，你算算需要多少秒才能把数据从硬盘读到内存里？

ssd读取300MB/s，就算apple这个残废点至少也有200，总共内存才2GB，你说能用几秒？如果再采用基本的措施，比如分块读取，延迟读取，2s又不是做不到。

大饼

原帖由 matri 于 2010-10-27 16:55 发表


ssd读取300MB/s，就算apple这个残废点至少也有200，总共内存才2GB，你说能用几秒？如果再采用基本的措施，比如分块读取，延迟读取，2s又不是做不到。 ...

分块读，延迟读？OS内存ms不可以这么工作吧

gifox

原帖由 yuba 于 2010-10-27 13:08 发表


:-)，用非SSD的老版air的用户恐怕不这么想

老AIR的性能问题可不是死在磁盘上的吧.

yuba

原帖由 gifox 于 2010-10-27 17:05 发表
老AIR的性能问题可不是死在磁盘上的吧.

"在AIR上SSD最大威力是大幅度降低了重量,机器厚度.还有移动性."

我是想说

和老Air相比，没有那么革命，尤其是和老款SSD版相比

chenyi1976

原帖由 大饼 于 2010-10-27 17:02 发表

分块读，延迟读？OS内存ms不可以这么工作吧

我觉得既然苹果是OS的主人，就算专门给MacBookAir做一个特殊的快速启动版本也不算离谱吧。。。不过一切都是菜鸟的胡乱猜测。。。：）

bemystar

原帖由 matri 于 2010-10-27 16:55 发表


ssd读取300MB/s，就算apple这个残废点至少也有200，总共内存才2GB，你说能用几秒？如果再采用基本的措施，比如分块读取，延迟读取，2s又不是做不到。 ...

每秒200ＭＢ, 1ＧＢ内存都要5秒.......
瓶颈在硬盘上, 什么措施管用啊

EE1

4碟raid0？差不多够了 。。(paopaobing(27))

[ 本帖最后由 EE1 于 2010-10-27 18:02 编辑 ]

yuba

近日台湾的PhotoFast公司率先推出了新版Macbook air的SSD升级方案——PhotoFast GM2 SFV1 Air。它是一款完全兼容新版Macbook air的SSD固态硬盘。最大容量可以达到256GB，由此可以轻松让你的11寸新air升级到256GB容量。

它使用的是SandForce SF-1200的SSD固态硬盘控制方案，根据厂商声称性能要比新air原配的东芝方案快上30%以上。这款固态硬盘仅有15g，支持传统的SATA界面。

bulaohu

15g让我迷糊了半天

yuba

原帖由 chenyi1976 于 2010-10-27 17:30 发表
我觉得既然苹果是OS的主人，就算专门给MacBookAir做一个特殊的快速启动版本也不算离谱吧。。。

从冷启动的表现看，苹果好像没有这么做

yuba

SanDisk CEO Eli Harari在近日的财务电话会议上对分析人士表示：“固态硬盘正在改变企业存储，而且再过一两代(固态硬盘)就会在笔记本和其他瘦客户端中全面普及。”

他也承认，现在只有一少部分笔记本配备了固态硬盘，但随着笔记本日渐轻薄，PC厂商只能更多地选择固态硬盘，比如苹果最近发布的新款MacBook Air就采用了东芝定制的固态硬盘。按照希捷的说法，固态硬盘在苹果电脑中的份额现在不过3-5％

大饼

原帖由 yuba 于 2010-10-28 10:37 发表
SanDisk CEO Eli Harari在近日的财务电话会议上对分析人士表示：“固态硬盘正在改变企业存储，而且再过一两代(固态硬盘)就会在笔记本和其他瘦客户端中全面普及。”

他也承认，现在只有一少部分笔记本配备了固态硬盘，但随着 ...

希捷没有自己的flash技术和生产线。将来SSD做大了，它的市场份额就小了。它现在肯定要打压SSD的。

yuba

混合硬盘是希捷的SSD方案，Seagate想做纯SSD随时可以做，大不了收购呗

它现在最大的问题是在传统硬盘方面落后于WD

yuba

在最近举行的Mac大会上，苹果公司首席执行官乔布斯正式对世界宣布，该公司的新一代MacBook Air超薄笔记本代表了笔记本电脑的未来。新一代MacBook Air在一些方面与传统笔记本电脑有着明显的不同，比如说它采用了固态硬盘作为默认存储而非传统笔记本所采用的HDD机械硬盘。正是由于这一点，传统硬盘巨头希捷相当不服气，并且坚信SSD固态硬盘不可能在笔记本领域剿灭传统硬盘产品，相反取代传统硬盘的只会是混合硬盘。

    “很显然，史蒂夫（乔布斯）只会站在史蒂夫的角度来考虑问题，仅就他们为消费者提供的产品来说，很明显是很有竞争力的。”希捷公司首席执行官Steve Luczo在该公司最近举行的季报电话会议上就外界的提问如此回答。“我只能说，即使就苹果公司本身而言，他们所销售的产品里SSD固态硬盘所占的比重也远比HDD机械硬盘所占的比重要小的多。我认为这个具体的数字大概在3%左右，可以肯定的是这个数字不到5%。很明显，这也并非他们所推出的第一款采用固态硬盘的产品。”

    随后Steve Luczo还表示，他此前早就已经拥有一款采用SSD固态硬盘的MacBook Air笔记本超过一年半了，而且他还发现固态硬盘“缺乏足够的容量”并且让自己不得不“花费大量的时间来清理文件”，以便“为一些体积不太大的内容腾挪出必要的空间”。另外Steve Luczo还抱怨其固态硬盘“比起最初购买时的12秒启动时间来，现在需要花费25甚至30秒的时间来启动”，当然这一点Steve Luczo也认为主要是和操作系统有关而非硬盘技术。

    作为对比，Steve Luczo指出希捷的SSD/HDD混合硬盘将不会存在这些令人懊恼的问题。混合硬盘将会集SSD固态硬盘和HDD机械硬盘的优点于一体，它既拥有SSD 固态硬盘的高性能优点，又拥有HDD机械硬盘的大容量优点，Steve Luczo认为混合硬盘才是笔记本电脑的未来。

gifox

基本上,大家都认为自己的产品行,对手的走错路了.

大饼

原帖由 yuba 于 2010-10-29 12:12 发表
在最近举行的Mac大会上，苹果公司首席执行官乔布斯正式对世界宣布，该公司的新一代MacBook Air超薄笔记本代表了笔记本电脑的未来。新一代MacBook Air在一些方面与传统笔记本电脑有着明显的不同，比如说它采用了固态硬盘作 ...

知道为啥Seagate会跳出来说这话？
看看它去年的业绩
Revenue           ▼  US$ 9.805 billion (2009)[1]
Operating income  ▼ US$ -2.635 billion (2009)[1]
Net income           ▼ US$ -3.086 billion (2009)[1]
Total assets           ▼ US$ 7.087 billion (2009)[1]
Total equity           ▼ US$ 1.524 billion (2009)[1]

下面是apple的
Revenue           ▲ $42.91 billion (2009)[4]
Operating income  ▲ $11.74 billion (2009)[5]
Profit                   ▲ $8.24 billion (2009)[5]
Total assets           ▲ $47.50 billion (2009)[4]
Total equity           ▲ $31.64 billion (2009)[4]