Re: [RFC] bcache-status

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On Tue, Sep 03, 2013 at 10:46:37PM +0200, Rolf Fokkens wrote:
> Hi,
> 
> bcache-status renders some weird output:
> 
> - "Total Cache Used" and "Total Cache Unused" don't always add up to
> "Total Cache Size"

Yeah... I calculate total cache size, then cache-used = cache-size * whatever
percentage bcache reports.  It won't add up exactly due to rounding errors.
0.999 -> 1.00.  That's rather a lot, really.

> - "Dirty Data" is -6 MB?

I think this was fixed in 3.11.

--D
> 
> Seems like bugs to me. Details below.
> 
> Rolf
> 
> [root@localhost bcache]# bcache-status -s
> --- bcache ---
> UUID c318c0b2-0b69-4f66-a729-23b82a9d0e91
> Block Size                  0.00KiB
> Bucket Size                 512.00KiB
> Congested?                  False
> Read Congestion             2.0ms
> Write Congestion            20.0ms
> Total Cache Size            1.00GiB
> Total Cache Used            20.00MiB    (1%)
> Total Cache Unused          1.00GiB    (99%)
> Dirty Data                  0B    (0%)
> Evictable Cache             1.00GiB    (100%)
> Replacement Policy          [lru] fifo random
> Cache Mode                  [writethrough] writeback writearound none
> Total Hits                  122    (100%)
> Total Misses                0
> Total Bypass Hits           0
> Total Bypass Misses         0
> Total Bypassed              0B
> --- Backing Device ---
>   Device File               /dev/sda3 (8:3)
>   bcache Device File        /dev/bcache1 (252:1)
>   Size                      7.00GiB
>   Cache Mode                [writethrough] writeback writearound none
>   Readahead                 0
>   Sequential Cutoff         4.00MiB
>   Merge sequential?         True
>   State                     clean
>   Writeback?                True
>   Dirty Data                0B
>   Total Hits                122    (100%)
>   Total Misses              0
>   Total Bypass Hits         0
>   Total Bypass Misses       0
>   Total Bypassed            0B
> --- Cache Device ---
>   Device File               /dev/sdb1 (8:17)
>   Size                      1.00GiB
>   Block Size                0.00KiB
>   Bucket Size               512.00KiB
>   Replacement Policy        [lru] fifo random
>   Discard?                  False
>   I/O Errors                0
>   Metadata Written          1.00KiB
>   Data Written              0B
>   Buckets                   4094
>   Cache Used                20.00MiB    (1%)
>   Cache Unused              1.00GiB    (99%)
> --- bcache ---
> UUID d07cd9a1-6211-4bba-bc37-a8ba8858ef4d
> Block Size                  0.00KiB
> Bucket Size                 512.00KiB
> Congested?                  False
> Read Congestion             2.0ms
> Write Congestion            20.0ms
> Total Cache Size            1.00GiB
> Total Cache Used            204.00MiB    (10%)
> Total Cache Unused          1.00GiB    (90%)
> Dirty Data                  0B    (0%)
> Evictable Cache             1.00GiB    (100%)
> Replacement Policy          [lru] fifo random
> Cache Mode                  writethrough [writeback] writearound none
> Total Hits                  1365    (81%)
> Total Misses                318
> Total Bypass Hits           3191    (100%)
> Total Bypass Misses         0
> Total Bypassed              46.00MiB
> --- Backing Device ---
>   Device File               /dev/sdc1 (8:33)
>   bcache Device File        /dev/bcache0 (252:0)
>   Size                      19.00GiB
>   Cache Mode                writethrough [writeback] writearound none
>   Readahead                 0
>   Sequential Cutoff         0B
>   Merge sequential?         True
>   State                     dirty
>   Writeback?                True
>   Dirty Data                -6.00MiB
>   Total Hits                1365    (81%)
>   Total Misses              318
>   Total Bypass Hits         3191    (100%)
>   Total Bypass Misses       0
>   Total Bypassed            46.00MiB
> --- Cache Device ---
>   Device File               /dev/sdd1 (8:49)
>   Size                      1.00GiB
>   Block Size                0.00KiB
>   Bucket Size               512.00KiB
>   Replacement Policy        [lru] fifo random
>   Discard?                  False
>   I/O Errors                0
>   Metadata Written          281.00KiB
>   Data Written              18.00MiB
>   Buckets                   4094
>   Cache Used                204.00MiB    (10%)
>   Cache Unused              1.00GiB    (90%)
> [root@localhost bcache]#
> 
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