"Jeanette C." <julien-3g/GUrBLTNIb1SvskN2V4Q@xxxxxxxxxxxxxxxx> writes: > Nov 30 2017, Peter has written: > Dear Peter, > ... >> this looks indeed pretty slow, is it an external usb-2 drive? > No, it's an internal S-Ata drive, apparently a SAMSUNG HD154UI. >> You may perform a simple check: >> >> sudo hdparm -tT /dev/sda > For cached reads this averages around 1200 MB/Sec, for buffered reads > around 108 MB/Sec. I didn't find an option to test the writing speed. As > a write test, I tried this: > dd if=/dev/zero of=out.file bs=1M count=100 > with a result of around 560MB/Sec >> If your are just recording, can you increase the buffer length in jack? > I could, but I already have it a period size of 256. At 512 I started to > get a noticeable delay. With cards that can potentially go down to 64 > samples, I feel a - perhaps unreasonable - hesitation to set the period > higher. Is this very unreasonable? Well, the problem is not as much your cards but the disk I/O. Getting more buffers will already help (-n 3 instead of the default -n 2). You can try improving this problem by using rtirq to distribute realtime priorities: do you already use threaded irqs? -- David Kastrup _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx https://lists.linuxaudio.org/listinfo/linux-audio-user
