Messages in this thread | | | From | Samium Gromoff <> | Subject | Ess Solo-1 interrupt behaviour | Date | Tue, 19 Feb 2002 15:52:24 +0300 (MSK) |
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I`ve recently spotted that a solo1 pci soundcard generates 16000+ interrupts/second with esd started idling.
What strikes me as odd is that my old good isa sb16 vibra does only 600+ interrupts.
Also i`ve had some strange experience of this interrupt load affecting the disk io. The situation was the next: i`ve had a large transfer to a samba boxen with this poor solo1 soundcard. I would like to emphasize that i turn off the drive write-caching ability in order to gain reliability, and that with write cacheing the following issues are hardly noticeable. So yes, i was copying large amount of data thru the 10mbit rtl8029s to the samba box. What i`ve tested are two situations: with esd on == effective 16,5k interrupts/second, and with esd off, and thus no interrupts generated by the solo1 card. What i`ve noticed quite disappointed me: with esd turned on, the disk writeout activity (well, the seek activity) was _much_ higher. Ie i`ve stopped esd, the seekage dropped down, i`ve started esd - seekage goes back.
So we basically have here two strange issues: 1. Ess Solo-1 driver generates awful lots of interrupts (16k/s) 2. Heavy interrupt load forces the elevator to make bad decisions
Info: linux-2.4.17-rmap12e, p2-300 128M RAM, rtl8029 NIC, Ess Solo-1 SB
regards, Samium Gromoff - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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