linuxaudio.org

Hi Paul, thanks for replying.
> to. It seems as though you think there is a difference in the

quoted text
> throughput when you read from a filesystem using st_blksize or some

> other size close to it, and that you either have or could measure it.

I was saying the man page provides the definitive guide to structuring

request sizes, and sndfile breaks the rules. The rules are there for

NFS, NTFS, EXT3, JFS, FTPS, SSHFS etc, PLUS future drivers.
> Erik is saying that he doesn't believe that you could measure the

quoted text
> difference.

Well, who knows? To be future-proof one must follow standards.
> values very, very far removed from st_blksize. This is why ardour
st_blksize is only a common denominator. It is not a "preferred size".

I.e. if st_blksize is 1024, you could use 1k, 4k or 16k as a buffer

size -- just don't read() 1020 bytes, which sndfile does, all the

time, with impunity :)
Now, have you measured that reading exactly 10,000 bytes at a time was

optimal? That would be an argument against st_blksize being

meaningful.
> tries to write in chunks of 256kB, although in truth it would be
So you *do* pay attention to even block sizes in Ardour :)
-- Dan

_______________________________________________

Linux-audio-dev mailing list

Linux-audio-dev@lists.linuxaudio.org

http://lists.linuxaudio.org/listinfo/linux-audio-dev