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On 12/06/2010 04:33 PM, Stroller wrote: |
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> |
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> On 27/11/2010, at 10:22pm, Nikos Chantziaras wrote: |
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>>> ... |
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>>> Does using the ck-sources kernel reduce the necessity to use ionice? |
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>> |
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>> To some degree, yes. |
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> |
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> Tried this late last week. You chose your words perfectly - there is only some degree of improvement. |
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> |
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> The machine seems much snappier if I return to an interactive session after leaving it idle for some time, but during DVD rips it is still unresponsive for tens of seconds at a time. It seems like maybe it responds quicker than mainline sources, but it's still so slow that it's both unusable and hard to be sure whether that's the case. |
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> |
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> Will try cgroups this week, perhaps. |
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cgroups will not help with that either. I bet the problem is that the |
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kernel doesn't care about what kind of data it is caching. I came |
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across this on LKML, but no one was interested in a solution. |
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The problem is that the kernel caches all data. Ripping a DVD will |
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consume 4GB cache, and all other data will be thrown out. Throwing that |
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all out again after the rip has finished is an awful lot of I/O load. |
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The smart thing to do would be for the kernel to not cache such stuff |
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(DVD rips, big video files, etc.) But it does. |
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