Brad Tilley wrote: > On Thu, Sep 17, 2009 at 8:58 PM, frantisek holop <min...@obiit.org> wrote: > >> does the built in usb emulated sd card reader works? >> i can read anything from it, but writing anything big >> (> 100MB) freezes first the process doing the writing, >> then the io subsystem, and eventually the whole system. > > I tested this evening on i386 -current as of 9-14-2009. > > # dd if=/dev/zero of=big.bin count=750 bs=1m > 750+0 records in > 750+0 records out > 786432000 bytes transferred in 46.633 secs (16864064 bytes/sec) > > I then tried to copy the 750 MB file to a 2 GB SD card that had a > msdos (fat) file system. The eeePC froze-up rather hard, but was still > sort-of usable. I would be glad to debug more should an OS developer > show me how/what to do. Here is some output I could copy before the > system went totally unresponsive... about 5 mins passed before the ath > msgs appeared on console: > > # cp big.bin /mnt > ath0 detached > ath0 at pci3 dev 0 function 0 "Atheros AR5424" rev 0x01: apic 1 int 18 (irq > 10) > ath0: AR5424 14.2 phy 7.0 rf 0.0, WOR0W, address 00:15:af:xx:xx:xx > > Rebooted (pressed and held power button) and tried the same thing with > an older 32 MB SD card (also formatted msdos), dd'ed a 28 MB file and > attempted to copy it. Same thing happened. > > So just for fun, I formatted newfs on both SD cards and tried the > copies again. Both worked fine with ffs file systems. This is not the > most accurate test, but it seems that it may to be msdos file system > related. Were your SD cards formatted fat? Have you had the issue on a > ffs formatted card? > > Brad >
It doesn't seem like just an msdos issue to me. I can reproduce the described behavior (without the ath detachment) on my eee pc 900 with an msdos and an ffs sd card. When it freezes while writing, there is a file created with a size of 0 bytes. Sometimes the write succeeds. But an ls on the mount point freezes with a D+ state. Building a kernel with MSDOSFS_DEBUG showed nothing so far. Dawe
