Date: 08 Nov 2001 17:23:41 +0000 From: Sansonetti Laurent <lorenzo@linuxbe.org> To: freebsd-hackers@freebsd.org Subject: Measuring interrupt latency Message-ID: <1005240221.454.13.camel@teneriel.teledisnet.be>
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Hi hackers, I have to measure ISR [*] under FreeBSD, so I'm building a small KLD which is hijacking a misc driver with timestamps... Is there a way to simulate a hardware irq from kernel land ? I saw swi_dispatcher() in /sys/kern/kern_intr.c, is this right ? In fact I have to start hardware irq by hand because I need to take timestamp at this moment.. Anyone have already measured ISR for FreeBSD ? Is that way correct ? Thanks in advance ! [*] : ISR : Interrupt Service Routine : time interval between hardware irq and first instruction of service routine for this irq. -- Sansonetti Laurent - http://lrz.linuxbe.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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