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SubjectRe: 2.4.11-pre2-xfs
Hello Steve Lord,

> > 2. kernel 2.4.11-pre2-xfs, with highmem support
> > 3. create ramdisk 512Mb and run "tiotest -c -f 110"
>
> And what type of filesystems were used? I am presuming XFS.

ext2 & xfs , but whis test with ext2

> > 4.
> > __alloc_pages: 0-order allocation failed (gfp=0x3d0/0) from c0127fe9
> > __alloc_pages: 0-order allocation failed (gfp=0x2f0/0) from c0127fe9
> > __alloc_pages: 0-order allocation failed (gfp=0x70/0) from c0127fe9
> > __alloc_pages: 0-order allocation failed (gfp=0x2f0/0) from c0127fe9
> > __alloc_pages: 0-order allocation failed (gfp=0x70/0) from c0127fe9

> Can you map that address onto a symbol by any chance?

#/ksymoops-2.4.3/ksymoops -A c0127fe9 -m /boot/System.map
...

Adhoc c0127fe8 <_alloc_pages+18/20>

6.

...
swap_dup: Bad swap file entry 3f41e02c
VM: killing process forwarderng
swap_free: Bad swap offset entry 3ce50000
swap_free: Bad swap file entry 3f41e02c
swap_free: Bad swap offset entry 38bb5000
...

What is it? Kernel or may be my hardware problem?



7. Interesting result (xfs speed):

buran:~ # cat ram_disk_ext2
buran:/ramdisk0/tiobench-0.3.1 # while (true) do ./tiotest -c -f 110 ;
sleep
60; done
Tiotest results for 4 concurrent io threads:

,----------------------------------------------------------------------.
| Item | Time | Rate | Usr CPU | Sys CPU |
+-----------------------+----------+--------------+----------+---------+
| Write 440 MBs | 17.9 s | 24.646 MB/s | 0.7 % | 60.8 % |
| Random Write 16 MBs | 0.5 s | 28.593 MB/s | 1.8 % | 60.4 % |
| Read 440 MBs | 14.1 s | 31.167 MB/s | 28.3 % | 43.6 % |
| Random Read 16 MBs | 0.5 s | 33.751 MB/s | 30.2 % | 51.8 % |
----------------------------------------------------------------------'

buran:~ # cat ram_disk_xfs
buran:/ramdisk0/tiobench-0.3.1 # while (true) do ./tiotest -c -f 110 ;
sleep
60; done
Tiotest results for 4 concurrent io threads:

,----------------------------------------------------------------------.
| Item | Time | Rate | Usr CPU | Sys CPU |
+-----------------------+----------+--------------+----------+---------+
| Write 440 MBs | 7.9 s | 55.974 MB/s | 1.8 % | 71.4 % |
| Random Write 16 MBs | 0.3 s | 45.764 MB/s | 0.0 % | 55.6 % |
| Read 440 MBs | 11.1 s | 39.529 MB/s | 38.0 % | 34.3 % |
| Random Read 16 MBs | 0.5 s | 32.868 MB/s | 27.3 % | 42.1 % |
----------------------------------------------------------------------'






--
bye.
Andrey Nekrasov, SpyLOG.
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