Date: Fri, 21 Jan 2000 18:33:59 +0900 From: Seigo Tanimura <tanimura@r.dl.itc.u-tokyo.ac.jp> To: smp@FreeBSD.org, hackers@FreeBSD.org Cc: Seigo Tanimura <tanimura@r.dl.itc.u-tokyo.ac.jp> Subject: Using spinning time efficiently? Message-ID: <14472.10247.374655.13283E@rina.r.dl.itc.u-tokyo.ac.jp>
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I have my SMP(dual) box running -current at home for local news and mail/ML server. Last night, when the news-mail gateway started to feed the articles to the MLs, I noticed that the ratio of CPU time usage for system call exceeded more than 50%, showing 55-60% every now and then. The frequencies of system call and interrupt are both around 13-18[k/sec]. (NB HZ in my box is increased up to 16kHz) I once thought something might be wrong, and then found (ALT)SYSCALL_LOCK spinning to wait for the lock to be released. Now I am wondering if we can contribute spinning time to anything else, say running another process, before the lock gets released. Is is possible to do so? -- Seigo Tanimura <tanimura@r.dl.itc.u-tokyo.ac.jp> <tanimura@FreeBSD.org> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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