* 20120419 disk scheduler
@ 2012-04-19 9:15 sunzixun
2012-04-19 9:27 ` Mike Galbraith
0 siblings, 1 reply; 4+ messages in thread
From: sunzixun @ 2012-04-19 9:15 UTC (permalink / raw)
To: linux-kernel mlist
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^ permalink raw reply [flat|nested] 4+ messages in thread* Re: 20120419 disk scheduler
2012-04-19 9:15 20120419 disk scheduler sunzixun
@ 2012-04-19 9:27 ` Mike Galbraith
2012-04-19 9:31 ` Zhi Yong Wu
0 siblings, 1 reply; 4+ messages in thread
From: Mike Galbraith @ 2012-04-19 9:27 UTC (permalink / raw)
To: sunzixun; +Cc: linux-kernel mlist
我不知道多少 LKML 读者可以阅读这篇文章。
On Thu, 2012-04-19 at 17:15 +0800, sunzixun wrote:
> -许加强(110781198) 3:33:12 PM
> 问一个问题： 对于一个block 我们做IO，虽然会经过disk scheduler那一层，我想问的就是 是不是 所有情况下IO
> scheduler都可以保证这个block里面 sector地址在前面的 sectors 一定比在后面的先被flush到磁盘上。
> eric(3251550) 3:33:31 PM
> 不能啊。
> 孙子荀 (448981776) 3:36:36 PM
> 我觉得能的吧？
> -eric(3251550) 3:38:35 PM
> 不能，很复杂。
> eric(3251550) 3:38:52 PM
> io受多重控制。
> -eric(3251550) 3:39:11 PM
> 要想保序。要用barrier io这种方式。
> 孙子荀 (448981776) 3:39:13 PM
> 就看 block size 如果和sector一样大
> 孙子荀 (448981776) 3:40:04 PM
> 我感觉还是应该可以啊
> -eric(3251550) 3:40:13 PM
> 除非这个一个io，而且不能被拆分。
> eric(3251550) 3:40:36 PM
> block和sector一样大。还谈何前面的sector和后面的sector
> 孙子荀 (448981776) 3:41:22 PM
> 对 你然后反过来想
> 孙子荀 (448981776) 3:41:39 PM
> 一样大 是可以保证的 。。那不一样大 怎么不保证呢
> eric(3251550) 3:43:09 PM
> 不一样大。。就麻烦了。。
> -eric(3251550) 3:43:17 PM
> 要被拆分。
> -eric(3251550) 3:43:43 PM
> 写io都要被拆成4k，4k处理。
> -eric(3251550) 3:44:02 PM
> 保证顺序，内核专门用了一种结构来处理。
> -eric(3251550) 3:44:06 PM
> barrier io.
> -孙子荀 (448981776) 3:44:20 PM
> 看来我还要想想
> -eric(3251550) 3:44:55 PM
> 看文档。
> -孙子荀 (448981776) 3:49:05 PM
> 加强是问 内核保证按sector ，还是包括最终的硬盘落地？
> -孙子荀 (448981776) 3:49:29 PM
> 如果经过raid cache ，磁盘交叉因子 那确实复杂一些
> -孙子荀 (448981776) 3:50:18 PM
>
> -BJ-许加强(110781198) 3:52:12 PM
> 恩 应该是不能保证的，得看磁头的当前位置决定
> -BJ-许加强(110781198) 3:53:08 PM
> 但如果不是简单的磁盘，而是SAN的那种， IO要走fiber channel或者infiniband到远处的磁盘，是不是也不能保证
> -eric(3251550) 3:53:20 PM
> 都不能。
> -孙子荀 (448981776) 3:55:22 PM
> 你问 io sched 我觉得这层是可以的
> -孙子荀 (448981776) 3:55:30 PM
> 但是硬件 那肯定不能
> -eric(3251550) 3:56:05 PM
> io sched也不能。。
> -BJ-许加强(110781198) 3:56:06 PM
> 我觉得这层 在排队的时候 应该也有可能让后面sector的插队到前面来吧？
> -eric(3251550) 3:56:38 PM
> 排队是按序的。但是随时可能被重新定位。
> -eric(3251550) 3:56:58 PM
> 调度要考虑饿死的情况。
> -BJ-许加强(110781198) 3:57:06 PM
> 被重新定位的时候 是考虑哪些因素？
> -孙子荀 (448981776) 3:57:11 PM
> io sched 为什么不能？
> -孙子荀 (448981776) 3:57:39 PM
> 重新定位 io sched 是不知道磁头信息的
> -eric(3251550) 3:57:39 PM
> 饿死。。长时等待。。请求合并。等等。
> -孙子荀 (448981776) 3:57:49 PM
> 对啊 ，等待 和合并 也是顺序的
> -eric(3251550) 3:57:51 PM
> 软件不管 磁头信息。
> -eric(3251550) 3:57:56 PM
> 那是ncq的实现。
> -孙子荀 (448981776) 3:57:58 PM
> 不会跳回
> -孙子荀 (448981776) 3:58:27 PM
> 比如 一个block 分成scetor 1 2 3 4
> 请问什么调度会 走成 4 2 1 3
> -eric(3251550) 3:59:04 PM
> 只是调度这一层吗？
> -孙子荀 (448981776) 3:59:12 PM
> 是啊
> -eric(3251550) 3:59:58 PM
> 调度这层不会。
> -BJ-许加强(110781198) 4:01:08 PM
> 假设调度层不会，那么调度层下面 哪些情况会导致乱序？
> -eric(3251550) 4:03:28 PM
> 很多情况。
> -孙子荀 (448981776) 4:03:45 PM
> 调度可以看源码 。我晚上仔细看看。。
>
> 硬件就太多了，像刚才EMC哥们告诉我的交叉因子
> -eric(3251550) 4:03:48 PM
> 上层应用还可能并发。
> -eric(3251550) 4:04:17 PM
> I/O barrier requests are used to guarantee ordering around the barrier requests.
> -eric(3251550) 4:04:39 PM
> All requests queued before a barrier request must be finished (made it
> to the physical medium) before the barrier request is started, and all
> requests queued after the barrier request must be started only after
> the barrier request is finished (again, made it to the physical
> medium).
> -eric(3251550) 4:05:04 PM
> 保序。。。前面的必须完成。后面的必须等保序io完成之后再完成。
> -eric(3251550) 4:05:13 PM
> 被插入 打断也不行。
> -eric(3251550) 4:05:51 PM
> 只保证 1，2，3，4，5也不行。还必须不能中间被插入新的io
> NР骒rybX肚v^)藓{.n+伐{赙zXФ≤}财z&j:+v赙zZ++zf＂h~izwア?ㄨ&)撷f^j谦ym@Aa囤\x7f0鹅hi\x7f
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: 20120419 disk scheduler
2012-04-19 9:27 ` Mike Galbraith
@ 2012-04-19 9:31 ` Zhi Yong Wu
2012-04-19 9:49 ` Steven Liu
0 siblings, 1 reply; 4+ messages in thread
From: Zhi Yong Wu @ 2012-04-19 9:31 UTC (permalink / raw)
To: Mike Galbraith; +Cc: sunzixun, linux-kernel mlist
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2012/4/19 Mike Galbraith <efault@gmx.de>:
> ÎÒ²»ÖªµÀ¶àÉÙ LKML ¶ÁÕß¿ÉÒÔÔĶÁÕâƪÎÄÕ¡£
very good, hehe. +1
>
> On Thu, 2012-04-19 at 17:15 +0800, sunzixun wrote:
>> -Ðí¼ÓÇ¿(110781198) 3:33:12 PM
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>> -Ëï×ÓÜ÷ (448981776) 3:58:27 PM
>> ±ÈÈç Ò»¸öblock ·Ö³Éscetor 1 2 3 4
>> ÇëÎÊʲôµ÷¶È»á ×ß³É 4 2 1 3
>> -eric(3251550) 3:59:04 PM
>> Ö»Êǵ÷¶ÈÕâÒ»²ãÂð£¿
>> -Ëï×ÓÜ÷ (448981776) 3:59:12 PM
>> ÊÇ°¡
>> -eric(3251550) 3:59:58 PM
>> µ÷¶ÈÕâ²ã²»»á¡£
>> -BJ-Ðí¼ÓÇ¿(110781198) 4:01:08 PM
>> ¼ÙÉèµ÷¶È²ã²»»á£¬ÄÇôµ÷¶È²ãÏÂÃæ ÄÄЩÇé¿ö»áµ¼ÖÂÂÒÐò£¿
>> -eric(3251550) 4:03:28 PM
>> ºÜ¶àÇé¿ö¡£
>> -Ëï×ÓÜ÷ (448981776) 4:03:45 PM
>> µ÷¶È¿ÉÒÔ¿´Ô´Âë ¡£ÎÒÍíÉÏ×Ðϸ¿´¿´¡£¡£
>>
>> Ó²¼þ¾ÍÌ«¶àÁË£¬Ïñ¸Õ²ÅEMC¸çÃǸæËßÎҵĽ»²æÒò×Ó
>> -eric(3251550) 4:03:48 PM
>> ÉϲãÓ¦Óû¹¿ÉÄܲ¢·¢¡£
>> -eric(3251550) 4:04:17 PM
>> I/O barrier requests are used to guarantee ordering around the barrier requests.
>> -eric(3251550) 4:04:39 PM
>> All requests queued before a barrier request must be finished (made it
>> to the physical medium) before the barrier request is started, and all
>> requests queued after the barrier request must be started only after
>> the barrier request is finished (again, made it to the physical
>> medium).
>> -eric(3251550) 4:05:04 PM
>> ±£Ðò¡£¡£¡£Ç°ÃæµÄ±ØÐëÍê³É¡£ºóÃæµÄ±ØÐëµÈ±£ÐòioÍê³ÉÖ®ºóÔÙÍê³É¡£
>> -eric(3251550) 4:05:13 PM
>> ±»²åÈë ´ò¶ÏÒ²²»ÐС£
>> -eric(3251550) 4:05:51 PM
>> Ö»±£Ö¤ 1£¬2£¬3£¬4£¬5Ò²²»ÐС£»¹±ØÐë²»ÄÜÖм䱻²åÈëеÄio
>> N§²æìrybX¶Çv^)Þº{.n+·¥{êçzX§¶¡Ü}²Æz&j:+vêçzZ++zf£¢h~izw¥¢?¨è&)ߢf^jÇ«ym@Aa¶Ú 0¶ìhi
>
>
> --
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Regards,
Zhi Yong Wu
ÿôèº{.nÇ+‰·Ÿ®‰†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±þG«éÿŠ{ayº\x1dʇڙë,j\a¢f£¢·hšïêÿ‘êçz_è®\x03(階ŠÝ¢j"ú\x1a¶^[m§ÿÿ¾\a«þG«éÿ¢¸?™¨èÚ&£ø§~á¶iO•æ¬z·švØ^\x14\x04\x1a¶^[m§ÿÿÃ\fÿ¶ìÿ¢¸?–I¥
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: 20120419 disk scheduler
2012-04-19 9:31 ` Zhi Yong Wu
@ 2012-04-19 9:49 ` Steven Liu
0 siblings, 0 replies; 4+ messages in thread
From: Steven Liu @ 2012-04-19 9:49 UTC (permalink / raw)
To: Zhi Yong Wu; +Cc: Mike Galbraith, sunzixun, linux-kernel mlist
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset=GB2312, Size: 4897 bytes --]
Hi Zhi Yong Wu
What's you said?
ÔÚ 2012Äê4ÔÂ19ÈÕ ÏÂÎç5:31£¬Zhi Yong Wu <zwu.kernel@gmail.com> дµÀ£º
> 2012/4/19 Mike Galbraith <efault@gmx.de>:
>> ÎÒ²»ÖªµÀ¶àÉÙ LKML ¶ÁÕß¿ÉÒÔÔĶÁÕâƪÎÄÕ¡£
> very good, hehe. +1
>>
>> On Thu, 2012-04-19 at 17:15 +0800, sunzixun wrote:
>>> -Ðí¼ÓÇ¿(110781198) 3:33:12 PM
>>> ÎÊÒ»¸öÎÊÌ⣺ ¶ÔÓÚÒ»¸öblock ÎÒÃÇ×öIO£¬ËäÈ»»á¾¹ýdisk schedulerÄÇÒ»²ã£¬ÎÒÏëÎʵľÍÊÇ ÊDz»ÊÇ ËùÓÐÇé¿öÏÂIO
>>> scheduler¶¼¿ÉÒÔ±£Ö¤Õâ¸öblockÀïÃæ sectorµØÖ·ÔÚÇ°ÃæµÄ sectors Ò»¶¨±ÈÔÚºóÃæµÄÏȱ»flushµ½´ÅÅÌÉÏ¡£
>>> eric(3251550) 3:33:31 PM
>>> ²»ÄÜ°¡¡£
>>> Ëï×ÓÜ÷ (448981776) 3:36:36 PM
>>> ÎÒ¾õµÃÄܵİɣ¿
>>> -eric(3251550) 3:38:35 PM
>>> ²»ÄÜ£¬ºÜ¸´ÔÓ¡£
>>> eric(3251550) 3:38:52 PM
>>> ioÊܶàÖØ¿ØÖÆ¡£
>>> -eric(3251550) 3:39:11 PM
>>> ÒªÏë±£Ðò¡£ÒªÓÃbarrier ioÕâÖÖ·½Ê½¡£
>>> Ëï×ÓÜ÷ (448981776) 3:39:13 PM
>>> ¾Í¿´ block size Èç¹ûºÍsectorÒ»Ñù´ó
>>> Ëï×ÓÜ÷ (448981776) 3:40:04 PM
>>> ÎҸоõ»¹ÊÇÓ¦¸Ã¿ÉÒÔ°¡
>>> -eric(3251550) 3:40:13 PM
>>> ³ý·ÇÕâ¸öÒ»¸öio£¬¶øÇÒ²»Äܱ»²ð·Ö¡£
>>> eric(3251550) 3:40:36 PM
>>> blockºÍsectorÒ»Ñù´ó¡£»¹Ì¸ºÎÇ°ÃæµÄsectorºÍºóÃæµÄsector
>>> Ëï×ÓÜ÷ (448981776) 3:41:22 PM
>>> ¶Ô ÄãÈ»ºó·´¹ýÀ´Ïë
>>> Ëï×ÓÜ÷ (448981776) 3:41:39 PM
>>> Ò»Ñù´ó ÊÇ¿ÉÒÔ±£Ö¤µÄ ¡£¡£ÄDz»Ò»Ñù´ó Ôõô²»±£Ö¤ÄØ
>>> eric(3251550) 3:43:09 PM
>>> ²»Ò»Ñù´ó¡£¡£¾ÍÂé·³ÁË¡£¡£
>>> -eric(3251550) 3:43:17 PM
>>> Òª±»²ð·Ö¡£
>>> -eric(3251550) 3:43:43 PM
>>> дio¶¼Òª±»²ð³É4k£¬4k´¦Àí¡£
>>> -eric(3251550) 3:44:02 PM
>>> ±£Ö¤Ë³Ðò£¬ÄÚºËרÃÅÓÃÁËÒ»ÖֽṹÀ´´¦Àí¡£
>>> -eric(3251550) 3:44:06 PM
>>> barrier io.
>>> -Ëï×ÓÜ÷ (448981776) 3:44:20 PM
>>> ¿´À´ÎÒ»¹ÒªÏëÏë
>>> -eric(3251550) 3:44:55 PM
>>> ¿´Îĵµ¡£
>>> -Ëï×ÓÜ÷ (448981776) 3:49:05 PM
>>> ¼ÓÇ¿ÊÇÎÊ Äں˱£Ö¤°´sector £¬»¹ÊÇ°üÀ¨×îÖÕµÄÓ²ÅÌÂäµØ£¿
>>> -Ëï×ÓÜ÷ (448981776) 3:49:29 PM
>>> Èç¹û¾¹ýraid cache £¬´ÅÅ̽»²æÒò×Ó ÄÇȷʵ¸´ÔÓһЩ
>>> -Ëï×ÓÜ÷ (448981776) 3:50:18 PM
>>>
>>> -BJ-Ðí¼ÓÇ¿(110781198) 3:52:12 PM
>>> ¶÷ Ó¦¸ÃÊDz»Äܱ£Ö¤µÄ£¬µÃ¿´´ÅÍ·µÄµ±Ç°Î»Öþö¶¨
>>> -BJ-Ðí¼ÓÇ¿(110781198) 3:53:08 PM
>>> µ«Èç¹û²»ÊǼòµ¥µÄ´ÅÅÌ£¬¶øÊÇSANµÄÄÇÖÖ£¬ IOÒª×ßfiber channel»òÕßinfinibandµ½Ô¶´¦µÄ´ÅÅÌ£¬ÊDz»ÊÇÒ²²»Äܱ£Ö¤
>>> -eric(3251550) 3:53:20 PM
>>> ¶¼²»ÄÜ¡£
>>> -Ëï×ÓÜ÷ (448981776) 3:55:22 PM
>>> ÄãÎÊ io sched ÎÒ¾õµÃÕâ²ãÊÇ¿ÉÒÔµÄ
>>> -Ëï×ÓÜ÷ (448981776) 3:55:30 PM
>>> µ«ÊÇÓ²¼þ Äǿ϶¨²»ÄÜ
>>> -eric(3251550) 3:56:05 PM
>>> io schedÒ²²»ÄÜ¡£¡£
>>> -BJ-Ðí¼ÓÇ¿(110781198) 3:56:06 PM
>>> ÎÒ¾õµÃÕâ²ã ÔÚÅŶӵÄʱºò Ó¦¸ÃÒ²ÓпÉÄÜÈúóÃæsectorµÄ²å¶Óµ½Ç°ÃæÀ´°É£¿
>>> -eric(3251550) 3:56:38 PM
>>> ÅŶÓÊÇ°´ÐòµÄ¡£µ«ÊÇËæʱ¿ÉÄܱ»ÖØж¨Î»¡£
>>> -eric(3251550) 3:56:58 PM
>>> µ÷¶ÈÒª¿¼ÂǶöËÀµÄÇé¿ö¡£
>>> -BJ-Ðí¼ÓÇ¿(110781198) 3:57:06 PM
>>> ±»ÖØж¨Î»µÄʱºò ÊÇ¿¼ÂÇÄÄЩÒòËØ£¿
>>> -Ëï×ÓÜ÷ (448981776) 3:57:11 PM
>>> io sched Ϊʲô²»ÄÜ£¿
>>> -Ëï×ÓÜ÷ (448981776) 3:57:39 PM
>>> ÖØж¨Î» io sched ÊDz»ÖªµÀ´ÅÍ·ÐÅÏ¢µÄ
>>> -eric(3251550) 3:57:39 PM
>>> ¶öËÀ¡£¡£³¤Ê±µÈ´ý¡£¡£ÇëÇóºÏ²¢¡£µÈµÈ¡£
>>> -Ëï×ÓÜ÷ (448981776) 3:57:49 PM
>>> ¶Ô°¡ £¬µÈ´ý ºÍºÏ²¢ Ò²ÊÇ˳ÐòµÄ
>>> -eric(3251550) 3:57:51 PM
>>> Èí¼þ²»¹Ü ´ÅÍ·ÐÅÏ¢¡£
>>> -eric(3251550) 3:57:56 PM
>>> ÄÇÊÇncqµÄʵÏÖ¡£
>>> -Ëï×ÓÜ÷ (448981776) 3:57:58 PM
>>> ²»»áÌø»Ø
>>> -Ëï×ÓÜ÷ (448981776) 3:58:27 PM
>>> ±ÈÈç Ò»¸öblock ·Ö³Éscetor 1 2 3 4
>>> ÇëÎÊʲôµ÷¶È»á ×ß³É 4 2 1 3
>>> -eric(3251550) 3:59:04 PM
>>> Ö»Êǵ÷¶ÈÕâÒ»²ãÂð£¿
>>> -Ëï×ÓÜ÷ (448981776) 3:59:12 PM
>>> ÊÇ°¡
>>> -eric(3251550) 3:59:58 PM
>>> µ÷¶ÈÕâ²ã²»»á¡£
>>> -BJ-Ðí¼ÓÇ¿(110781198) 4:01:08 PM
>>> ¼ÙÉèµ÷¶È²ã²»»á£¬ÄÇôµ÷¶È²ãÏÂÃæ ÄÄЩÇé¿ö»áµ¼ÖÂÂÒÐò£¿
>>> -eric(3251550) 4:03:28 PM
>>> ºÜ¶àÇé¿ö¡£
>>> -Ëï×ÓÜ÷ (448981776) 4:03:45 PM
>>> µ÷¶È¿ÉÒÔ¿´Ô´Âë ¡£ÎÒÍíÉÏ×Ðϸ¿´¿´¡£¡£
>>>
>>> Ó²¼þ¾ÍÌ«¶àÁË£¬Ïñ¸Õ²ÅEMC¸çÃǸæËßÎҵĽ»²æÒò×Ó
>>> -eric(3251550) 4:03:48 PM
>>> ÉϲãÓ¦Óû¹¿ÉÄܲ¢·¢¡£
>>> -eric(3251550) 4:04:17 PM
>>> I/O barrier requests are used to guarantee ordering around the barrier requests.
>>> -eric(3251550) 4:04:39 PM
>>> All requests queued before a barrier request must be finished (made it
>>> to the physical medium) before the barrier request is started, and all
>>> requests queued after the barrier request must be started only after
>>> the barrier request is finished (again, made it to the physical
>>> medium).
>>> -eric(3251550) 4:05:04 PM
>>> ±£Ðò¡£¡£¡£Ç°ÃæµÄ±ØÐëÍê³É¡£ºóÃæµÄ±ØÐëµÈ±£ÐòioÍê³ÉÖ®ºóÔÙÍê³É¡£
>>> -eric(3251550) 4:05:13 PM
>>> ±»²åÈë ´ò¶ÏÒ²²»ÐС£
>>> -eric(3251550) 4:05:51 PM
>>> Ö»±£Ö¤ 1£¬2£¬3£¬4£¬5Ò²²»ÐС£»¹±ØÐë²»ÄÜÖм䱻²åÈëеÄio
>>> N§²æìrybX¶Çv^)Þº{.n+·¥{êçzX§¶¡Ü}²Æz&j:+vêçzZ++zf£¢h~izw¥¢?¨è&)ߢf^jÇ«ym@Aa¶Ú 0¶ìhi
>>
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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>> Please read the FAQ at http://www.tux.org/lkml/
>
>
>
> --
> Regards,
>
> Zhi Yong Wu
ÿôèº{.nÇ+‰·Ÿ®‰†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±þG«éÿŠ{ayº\x1dʇڙë,j\a¢f£¢·hšïêÿ‘êçz_è®\x03(階ŠÝ¢j"ú\x1a¶^[m§ÿÿ¾\a«þG«éÿ¢¸?™¨èÚ&£ø§~á¶iO•æ¬z·švØ^\x14\x04\x1a¶^[m§ÿÿÃ\fÿ¶ìÿ¢¸?–I¥
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2012-04-19 9:49 UTC | newest]
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2012-04-19 9:15 20120419 disk scheduler sunzixun
2012-04-19 9:27 ` Mike Galbraith
2012-04-19 9:31 ` Zhi Yong Wu
2012-04-19 9:49 ` Steven Liu
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