Re: hard disk performance on Allnet 6500 (like Thecus N2100)

[Martin Michlmayr <tbm@cyrius.com>]

* Riku Voipio <riku.voipio@iki.fi> [2007-09-24 23:48]:
> Did you enable the dma engine in kernel config? There is three patches
> that could help:

I'm glad your email caused me to double check.  While the dma engine
itself was enabled, some other options were missing.  With the
following options enabled, my performance goes to:

 Timing cached reads:   382 MB in  2.01 seconds = 190.16 MB/sec
 Timing buffered disk reads:  144 MB in  3.03 seconds =  47.59 MB/sec

CONFIG_DMA_ENGINE=y
CONFIG_DMA_COPY_CLEAR_PAGE=y
CONFIG_DMA_COPY_CLEAR_PAGE=y
CONFIG_POLLED_DMA_COPY_USER=y
CONFIG_INTEL_IOP_ADMA=y

I'll ask Dan Williams of Intel about the status of these patches.
If we're really lucky, maybe they'll be in the kernel that will be used
for the "etch+0.5" update (i.e. a new 2.6.2x based kernel for etch).
If not, we can make a n2100 repository somewhere with a kernel that
has the dma engine patches.
-- 
Martin Michlmayr
http://www.cyrius.com/