| 1 |
maybe it will be fixed in kernel 3.9 |
| 2 |
http://www.phoronix.com/scan.php?page=news_item&px=MTMxNzA |
| 3 |
|
| 4 |
2013/3/11 Florian Philipp <lists@×××××××××××.net> |
| 5 |
|
| 6 |
> Am 10.03.2013 13:48, schrieb Florian Philipp: |
| 7 |
> > Am 10.03.2013 00:53, schrieb cosmoslx lin:> |
| 8 |
> >> 2013/3/10 Volker Armin Hemmann <volkerarmin@××××××××××.com |
| 9 |
> >> <mailto:volkerarmin@××××××××××.com>> |
| 10 |
> >> |
| 11 |
> >> Am 09.03.2013 19:15, schrieb Florian Philipp: |
| 12 |
> >> > Hi list! |
| 13 |
> >> > |
| 14 |
> >> > Whenever I do sequential IO for a long stretch of time (e.g. |
| 15 |
> >> md5summing |
| 16 |
> >> > 40 GB), I'm experiencing high load (ca. 6 on a 4 CPU system) and |
| 17 |
> >> > temporary freezes of most applications. For example, switching |
| 18 |
> between |
| 19 |
> >> > tabs in konsole sometimes takes more than 2 seconds. |
| 20 |
> >> > |
| 21 |
> > [...] |
| 22 |
> >> > |
| 23 |
> >> congratulation. You hit 'the bug'. Been around for ages, but for |
| 24 |
> magical |
| 25 |
> >> reasons kernel dev are unable to see or unable to do something |
| 26 |
> about it. |
| 27 |
> >> If you are using a vanilla kernel, posting on lkml might be the |
| 28 |
> right |
| 29 |
> >> thing to do. |
| 30 |
> >> |
| 31 |
> >> I have try the BFQ patch outside of the kernel mainline, it works well. |
| 32 |
> >> Maybe you would like to see: |
| 33 |
> >> http://algo.ing.unimo.it/people/paolo/disk_sched/ |
| 34 |
> >> |
| 35 |
> > |
| 36 |
> > Thanks. I'll try pf-sources which should to include that patch set. |
| 37 |
> > |
| 38 |
> > Regards, |
| 39 |
> > Florian Philipp |
| 40 |
> > |
| 41 |
> |
| 42 |
> pf-sources (only BFQ enabled, not BFS) helped somewhat. kswapd still |
| 43 |
> likes to keep one CPU busy when IO is happening but I suspect cleancache |
| 44 |
> to be the culprit for that. I'll test without it later. |
| 45 |
> |
| 46 |
> Regards, |
| 47 |
> Florian Philipp |
| 48 |
> |
| 49 |
> |
| 50 |
> |
| 51 |
|
| 52 |
|
| 53 |
-- |
| 54 |
|
| 55 |
Best regards! |
| 56 |
|
| 57 |
------------------------------------------------ |
| 58 |
|
| 59 |
Yu-yu Lin(林育宇) |
| 60 |
|
| 61 |
The Guangdong Key Laboratory of Information Security Technology (IST), |
| 62 |
School of Information Science and Technology, |
| 63 |
Sun Yat-sen (Zhongshan) University (中山大学), |
| 64 |
Guangzhou,P.R.China. |
| 65 |
|
| 66 |
Email: cosmoslx@×××××.com |
| 67 |
|
| 68 |
------------------------------------------------ <cosmoslx@×××××.com> |
Archives