Arch Linux

scheiss_freaks

Member

From: Munich - Germany

Registered: 2008-10-23

Posts: 4

[still not solved] Internal SD card even slower with new Kernel

Hi,
i'm using a 300x 8GB CF as boot drive in my Thinkpad X41 and a 16GB SDHC Class 6 in the internal card reader for other files.
On my Desktop PC the SD card has a reading performance of ~16MB/s.
Right after the installation of arch the result of hdparm -tT was ~7MB/s, not really fast, but almost acceptable.
But now after upgrading to Kernel 2.6.27 I only get 3.25MB/s and the mouse is stucking while moving bigger files.
The SD card is /dev/mmcblk0 and the sdhci and sdhci_pci modules are loaded.

Any suggestions how to improve performance would be great.

Last edited by scheiss_freaks (2008-11-05 20:40:17)

lilsirecho

Veteran

Registered: 2003-10-24

Posts: 5,000

Re: [still not solved] Internal SD card even slower with new Kernel

The 300x CF 8gb card has to be mounted as an hdd to obtain 300x speed and should give an hdparm -t read speed of 42MB/sec(when mounted as an HDD with DMA4 or greater).

I suspect it is mounted as an sd device since your upgrade.

I have a pair of 8GB 266x Adata CF cards mounted through sata2cf adapters that have a raid0 read speed of 82MB/s.

A third 4 GB CF operates through a third sata/CF device and has a read speed of 42MB/sec.

The CF device is seen as an sd device when so connected but performs at the CF UDMA format as provided by the adapter.

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Prediction...This year will be a very odd year!
Hard work does not kill people but why risk it: Charlie Mccarthy
A man is not complete until he is married..then..he is finished.
When ALL is lost, what can be found? Even bytes get lonely for a little bit!     X-ray confirms Iam spineless!

scheiss_freaks

Member

From: Munich - Germany

Registered: 2008-10-23

Posts: 4

Re: [still not solved] Internal SD card even slower with new Kernel

I don't have any problems with the CF card, I just mentioned it to explain why I'm using an SD card as additional "hard drive" sorry if my post was a bit confusing on this.
My CF does reach read speeds over 40MB/s.
I only have problems with the SDHC card.

lilsirecho

Veteran

Registered: 2003-10-24

Posts: 5,000

Re: [still not solved] Internal SD card even slower with new Kernel

My oops!

---

Prediction...This year will be a very odd year!
Hard work does not kill people but why risk it: Charlie Mccarthy
A man is not complete until he is married..then..he is finished.
When ALL is lost, what can be found? Even bytes get lonely for a little bit!     X-ray confirms Iam spineless!

scheiss_freaks

Member

From: Munich - Germany

Registered: 2008-10-23

Posts: 4

Re: [still not solved] Internal SD card even slower with new Kernel

I'm still searching for any suggestions. Just booted Archlive and tested the SD-Card and it reads ~7MB/s on that version.

lilsirecho

Veteran

Registered: 2003-10-24

Posts: 5,000

Re: [still not solved] Internal SD card even slower with new Kernel

It looks like the SDHC card is being run in USB 1.1........................

---

Prediction...This year will be a very odd year!
Hard work does not kill people but why risk it: Charlie Mccarthy
A man is not complete until he is married..then..he is finished.
When ALL is lost, what can be found? Even bytes get lonely for a little bit!     X-ray confirms Iam spineless!

lilsirecho

Veteran

Registered: 2003-10-24

Posts: 5,000

Re: [still not solved] Internal SD card even slower with new Kernel

Lsusb

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Prediction...This year will be a very odd year!
Hard work does not kill people but why risk it: Charlie Mccarthy
A man is not complete until he is married..then..he is finished.
When ALL is lost, what can be found? Even bytes get lonely for a little bit!     X-ray confirms Iam spineless!

scheiss_freaks

Member

From: Munich - Germany

Registered: 2008-10-23

Posts: 4

Re: [still not solved] Internal SD card even slower with new Kernel

bash-3.2# lsusb
Bus 005 Device 001: ID 1d6b:0002  
Bus 004 Device 001: ID 1d6b:0001  
Bus 003 Device 006: ID 0483:2016 SGS Thomson Microelectronics Fingerprint Reader
Bus 003 Device 005: ID 0a5c:201e Broadcom Corp. 
Bus 003 Device 001: ID 1d6b:0001  
Bus 002 Device 003: ID 046d:c025 Logitech, Inc. MX500 Optical Mouse
Bus 002 Device 001: ID 1d6b:0001  
Bus 001 Device 001: ID 1d6b:0001