Date: 11 Jun 1999 23:15:15 -0700 From: Arun Sharma <adsharma@home.com> To: "David E. Cross" <crossd@cs.rpi.edu> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: High syscall overhead? Message-ID: <m34skeeyh8.fsf@c62443-a.frmt1.sfba.home.com> In-Reply-To: "David E. Cross"'s message of "Fri, 11 Jun 1999 10:40:37 -0400" References: <199906111440.KAA70517@cs.rpi.edu>
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"David E. Cross" <crossd@cs.rpi.edu> writes: > Looking through the exception.s it appears that on entry to the > kernel an MP lock is obtained... I thought we had splX(); to > protect concurancy in the kernel. Can someone explain to me why is SYSCALL_LOCK necessary ? It certainly seems to hurt system call performance on a MP machine. Also, is there any data on lock contention in FreeBSD ? Is anyone working on decomposing some of the giant locks ? -Arun To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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