Red Hat Bugzilla – Bug 163660
Slow write performance on PNY brand CF card in PCMCIA adapter with EXT2 fs
Last modified: 2013-03-05 22:43:53 EST
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Description of problem:
I have been evaluating a number of compact flash cards and one of my tests is write speed from my
development laptop (an IBM T30). I am running FC3 (latest) and using a typical CF/PCMCIA adapter.
I found that the PNY 512 Mb card (THNCF512MPG) had significantly worse performance than all of the
other cards I tested (SanDisk, Crucial, Lexar). A large write that took 1-2 minutes on the other cards
took more than 20 minutes on the PNY card.
I tested the same card on two other systems and while it was not the fastest card I tested, it was at least
useable. On linux it was essentially unuseable.
Finally, this problem is only seen when the card is formatted with ext2 file system. When formatted
with vfat (e.g. FAT16) it has fairly fast performance.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Insert PNY 512 Mb card (THNCF512MPG) into CF/PCMCIA adapter
2. Insert adapter into laptop slot and observe volume(s) mounting
3. Format the CF card into two partitions, equal size, and mkfs "ext2" on one and "vfat" on the other
4. Eject/Insert the card, verify the volumes mount, and verify (/etc/mtab) that they mounted with
5. Copy a large file (I used approx 6mb binary) onto each partition and measure the elapsed time
Actual Results: About 15 sec. to copy onto vfat and nearly 20 minutes (I gave up) copying onto ext2
Expected Results: Roughly equal speeds and dominated by hardware speed not be drive format.
Fedora Core 3 is now maintained by the Fedora Legacy project for security
updates only. If this problem is a security issue, please reopen and
reassign to the Fedora Legacy product. If it is not a security issue and
hasn't been resolved in the current FC5 updates or in the FC6 test
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Setting status to "INSUFFICIENT_DATA". If you can reproduce this bug in the
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