https://bugzilla.kernel.org/show_bug.cgi?id=15884 Summary: cd-burning reduces other simultaneous IO performance Product: IO/Storage Version: 2.5 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: IDE AssignedTo: io_ide@xxxxxxxxxxxxxxxxxxxx ReportedBy: danielhollocher@xxxxxxxxx CC: danielhollocher@xxxxxxxxx Regression: No Hey folks, I having a problem similar to one of the commenters on bug #13347. But that report in general is kinda confusing, and it seemed like the devs had trouble understanding the issue. One possibility is that the issue that I and the commenter have may not be the same as the original bug in 13347. I also have a reliable way to trigger the bug in a bad way, just burn a cd. So, I am posting this new bug report. Basically, my system feels a bit sluggish, and when I try to burn a CD, my system becomes unusable. I will explain in further detail after I describe my setup. My system: ASUS P5B motherboard a 500GB SATA drive connect through one of the SATA ports (sda) an 60 GB PATA drive, connect as the master on the single Jmicron IDE (sdb) a Verbatim CD-RW, connected on the slave of the same IDE My OSs: I have windows on the first partition of sdb I have my main Ubuntu install on another partition of sdb (linux version 2.6.31) I have a testing Ubuntu install on one of the partitions of sda (linux version 2.6.32) Now, I have always noticed that my main felt a bit sluggish. Windows felt faster, and I would just chock it up to "weirdness". I suspect that I'm getting poor performance in general, but it really shows up when I'm burning a disk. My computer becomes unusable, as any IO operations no matter how small end up having several second wait times. I have to be careful just moving a window around. I tested on windows, and I can burn a disk, defrag the drive, and open open office all at the same time. The system is correspondingly sluggish, but that is to be expected. I get no lockups like I do on linux. I have had this issue for the life of the computer, accross several ubuntu releases. I have also tester a kernel from the ubuntu mainline ppa of version 2.6.33. As you can see, I haven't tried downloading the source code and compiling myself yet. I don't know if that makes a difference. Here are some illuminating tests. I was booted on the nice drive (sda) with the testing install. $ sudo hdparm -tT /dev/sdb /dev/sdb: Timing cached reads: 2146 MB in 2.00 seconds = 1073.83 MB/sec Timing buffered disk reads: 128 MB in 3.03 seconds = 42.27 MB/sec $ sudo hdparm -tT /dev/sda /dev/sda: Timing cached reads: 2308 MB in 2.00 seconds = 1154.93 MB/sec Timing buffered disk reads: 284 MB in 3.01 seconds = 94.50 MB/sec I started the burn process, and caught this test while it was erasing the CDRW: /dev/sdb: Timing cached reads: 2294 MB in 2.00 seconds = 1147.90 MB/sec Timing buffered disk reads: 2 MB in 88.41 seconds = 23.16 kB/sec During the burn process, which displays a speed of 0.7MB/s: $ sudo hdparm -tT /dev/sdb /dev/sdb: Timing cached reads: 908 MB in 2.00 seconds = 453.90 MB/sec Timing buffered disk reads: 6 MB in 3.87 seconds = 1.55 MB/sec $ sudo hdparm -tT /dev/sda /dev/sda: Timing cached reads: 2254 MB in 2.00 seconds = 1127.28 MB/sec Timing buffered disk reads: 282 MB in 3.00 seconds = 93.98 MB/sec So while burning on the slave of the IDE, I loose almost all my "buffered disk read" performance for the master IDE channel! Does that make sense? If I burn a cd at 1MB/s, it should not take up 41MB/s bandwidth. -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
