Hai...
    Here is the benchmark results of tiobench for 2.5.43 kernel and 2.4.19
kernel. There is a  drastic performance degradation in Read operations of
2.5.43 kernel as compared to 2.4.19 kernel though there is a little
improvement in write operations. Any cooments..?

Details of Test Machine:
=================
Hardware: 400Mhz  Celeron with 64Mb Ram with ext2 file system.

************************************************************************
linux-2.5.43
Tiotest results for 4 concurrent io threads:
,----------------------------------------------------------------------.
| Item                  | Time     | Rate         | Usr CPU  | Sys CPU |
+-----------------------+----------+--------------+----------+---------+
| Write          40 MBs |    8.9 s |   4.509 MB/s |   0.4 %  |   6.2 % |
| Random Write   16 MBs |   19.5 s |   0.802 MB/s |   0.0 %  |   1.4 % |
| Read           40 MBs |    7.9 s |   5.090 MB/s |   0.3 %  |   4.9 % |
| Random Read    16 MBs |   37.3 s |   0.419 MB/s |   0.1 %  |   1.2 % |
`----------------------------------------------------------------------'
Tiotest latency results:
,-------------------------------------------------------------------------.
| Item         | Average latency | Maximum latency | % >2 sec | % >10 sec |
+--------------+-----------------+-----------------+----------+-----------+
| Write        |        2.144 ms |     3340.874 ms |  0.02930 |   0.00000 |
| Random Write |        7.420 ms |     8241.095 ms |  0.10000 |   0.00000 |
| Read         |        2.526 ms |      534.798 ms |  0.00000 |   0.00000 |
| Random Read  |       35.709 ms |      131.234 ms |  0.00000 |   0.00000 |
|--------------+-----------------+-----------------+----------+-----------|
| Total        |        7.737 ms |     8241.095 ms |  0.02458 |   0.00000 |
`--------------+-----------------+-----------------+----------+-----------'


*********************************************************************
linux-2.4.19
Tiotest results for 4 concurrent io threads:
,----------------------------------------------------------------------.
| Item                  | Time     | Rate         | Usr CPU  | Sys CPU |
+-----------------------+----------+--------------+----------+---------+
| Write          40 MBs |    9.7 s |   4.135 MB/s |   0.3 %  |   3.9 % |
| Random Write   16 MBs |   27.3 s |   0.573 MB/s |   0.0 %  |   0.4 % |
| Read           40 MBs |    1.7 s |  23.597 MB/s |   0.6 %  |  14.2 % |
| Random Read    16 MBs |    4.0 s |   3.879 MB/s |   0.7 %  |   4.5 % |
`----------------------------------------------------------------------'
Tiotest latency results:
,-------------------------------------------------------------------------.
| Item         | Average latency | Maximum latency | % >2 sec | % >10 sec |
+--------------+-----------------+-----------------+----------+-----------+
| Write        |        0.618 ms |     1449.211 ms |  0.00000 |   0.00000 |
| Random Write |        0.100 ms |       61.018 ms |  0.00000 |   0.00000 |
| Read         |        0.158 ms |       59.913 ms |  0.00000 |   0.00000 |
| Random Read  |        1.561 ms |      484.705 ms |  0.00000 |   0.00000 |
|--------------+-----------------+-----------------+----------+-----------|
| Total        |        0.512 ms |     1449.211 ms |  0.00000 |   0.00000 |
`--------------+-----------------+-----------------+----------+-----------'


Rgds,
Siva