Subject: Re: [linux-audio-dev] Latencytest results
From: Jussi Laako (jussi.laako_AT_kolumbus.fi)
Date: Sat Dec 22 2001 - 00:01:49 EET
Paul Davis wrote:
>
> nobody can comment much on these graphs when they are generated with
> an IDE disk system for which the hdparms set up is not reported.
Now those are reported, see below.
> however, it would appear that there are potential problems with the
> video adaptor that you have when used with XFree 4.1.99-cvs. it
> wouldn't be the first such case.
I did some driver hacking and managed to fix it, results with 2.4.16-ll
kernel and fixed radeon driver:
http://www.pp.song.fi/~visitor/latencytest3/3x256.html
> the rest of your results appear OK, though also hard to comment on
> because its not clear how the audio interface was configured by
> latencytest (2 channels? 10? etc.)
2 channels, 44.1 kHz as the default is.
> as a footnote, 2.4.12-ac3 still used the vanRiel VM system, which is
> known to perform poorly under extreme system load.
Results with 2.4.16-ll are at:
http://www.pp.song.fi/~visitor/latencytest2/3x256.html
There is nasty problem with disk IO (cache) which I think is fixed in 2.4.17
so I'm not going to hack 2.4.16.
- Jussi Laako
----- 8< ------
/dev/hdb:
multcount = 16 (on)
I/O support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 2491/255/63, sectors = 40020624, start = 0
----------VIA BusMastering IDE Configuration----------------
Driver Version: 3.29
South Bridge: VIA vt82c686b
Revision: ISA 0x40 IDE 0x6
Highest DMA rate: UDMA100
BM-DMA base: 0xb800
PCI clock: 33MHz
Master Read Cycle IRDY: 0ws
Master Write Cycle IRDY: 0ws
BM IDE Status Register Read Retry: yes
Max DRDY Pulse Width: No limit
-----------------------Primary IDE-------Secondary IDE------
Read DMA FIFO flush: yes yes
End Sector FIFO flush: no no
Prefetch Buffer: yes no
Post Write Buffer: yes no
Enabled: yes yes
Simplex only: no no
Cable Type: 80w 80w
-------------------drive0----drive1----drive2----drive3-----
Transfer Mode: UDMA UDMA DMA UDMA
Address Setup: 30ns 30ns 60ns 30ns
Cmd Active: 90ns 90ns 90ns 90ns
Cmd Recovery: 30ns 30ns 90ns 90ns
Data Active: 90ns 90ns 90ns 90ns
Data Recovery: 30ns 30ns 90ns 30ns
Cycle Time: 30ns 20ns 180ns 30ns
Transfer Rate: 66.0MB/s 99.0MB/s 11.0MB/s 66.0MB/s
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