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Am 14.08.2012 19:21, schrieb Jason Weisberger: |
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> Sure, but wouldn't compression make write operations slower? And isn't he |
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> looking for performance? |
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> On Aug 14, 2012 1:14 PM, "Pandu Poluan" <pandu@××××××.info> wrote: |
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> |
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>> |
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>> On Aug 14, 2012 11:42 PM, "Helmut Jarausch" <jarausch@××××××××××××××××.de> |
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>> wrote: |
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>>> |
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>>> On 08/14/2012 04:07:39 AM, Adam Carter wrote: |
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>>>> |
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>>>>> I think btrfs probably is meant to provide a lot of the modern |
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>>>>> features like reiser4 or xfs |
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>>>> |
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>>>> Unfortunately btrfs is still generally slower than ext4 for example. |
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>>>> Checkout http://openbenchmarking.org/, eg |
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>>>> http://openbenchmarking.org/s/ext4%20btrfs |
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>>>> |
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>>>> The OS will use any spare RAM for disk caching, so if there's not much |
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>>>> else running on that box, most of your content will be served from |
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>>>> RAM. It may be that whatever fs you choose wont make that much of a |
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>>>> difference anyways. |
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>>>> |
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>>> |
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>>> If one can run a recent kernel (3.5.x) btrfs seems quite stable (It's |
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>> used by some distribution and Oracle for real work) |
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>>> Most benchmark don't use compression since other FS can't use it. But |
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>> that's unfair. With compression, one needs to read |
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>>> much less data (my /usr partition has less than 50% of an ext4 |
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>> partition, savings with the root partition are even higher). |
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>>> |
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>>> I'm using the mount options |
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>> compress=lzo,noacl,noatime,autodefrag,space_cache which require a recent |
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>> kernel. |
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>>> |
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>>> I'd give it a try. |
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>>> |
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>>> Helmut. |
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>>> |
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>> |
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>> Are the support tools for btrfs (fsck, defrag, etc.) already complete? |
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>> |
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>> If so, I certainly would like to take it out for a spin... |
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>> |
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>> Rgds, |
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>> |
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>> |
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> |
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I have enough cpu power at hand for compression, I guess that should not |
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be the issue. But the cache dir mostly consists of prescaled jpeg |
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images, so compressing them again would not give me any benefits, speed- |
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or size-wise. |
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