Re: Poor read performance when sequential write presents

[Giuliano Pochini]

>> I did a IO test with one sequential read and one sequential write
>> to different files. I expected somewhat similar throughput on read
>> and write. But it seemed that the read is blocked until the write
>> finishes. After the write process finished, the read process slowly
>> picks up the speed. Is Linux buffer cache in favor of write? How
>> to tune it?
> [...]
> 2: Apply http://www.zip.com.au/~akpm/linux/patches/2.4/2.4.19-pre5/read-latency2.patch

Hmmm, someone wrote a patch to fix another related problem: the fact
that multiple readers read at a very different speed. It's not unusual
that one reader gets stuck until all other have finished. I don't
remember who wrote that patch, sorry.

Bye.