Date: Fri, 20 Jun 2014 09:00:18 +0800 From: "=?gb18030?B?1cXqzw==?=" <zganghanhan@foxmail.com> To: "=?gb18030?B?QW5kcmV5IFpvbm92?=" <zont@FreeBSD.org> Cc: =?gb18030?B?ZnJlZWJzZC1uZXQ=?= <freebsd-net@freebsd.org> Subject: =?gb18030?B?u9i4tKO6IHBvdyBmdW5jdGlvbiBpbiBrZXJuZWwg?= =?gb18030?B?c3BhY2U=?= Message-ID: <tencent_159CA2BC7E46BD14532BB2CA@qq.com> In-Reply-To: <53A33448.9060909@FreeBSD.org> References: <mailman.75.1403092802.14182.freebsd-net@freebsd.org> <tencent_34C23E3A7E7FDFEA644A3392@qq.com> <53A33448.9060909@FreeBSD.org>
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Hi: I am doing a research on D2TCP(http://dl.acm.org/citation.cfm?id=2342388), I just want to implement it into the linux kernel. When calculating the penalty function, it is p = a^d, where 0< a < 1 and 0< d < 1. Since the kernel only offers integer, so in my code, so I let a multiply 2^10. But I have no idea of calculating a^d when 0< d < 1. May be I want a approximate algorithm or other methods. Can you help me ? thanks~ ------------------ 祝好， 张晗 ---------- HanZhang School of Computer Science Tsinghua University, Beijing, 100084, P.R.CHINA Mobile: +86 156-526-59782 E-mail: zhanghan@csnet1.cs.tsinghua.edu.cn ------------------ 原始邮件 ------------------ 发件人: "Andrey Zonov";<zont@FreeBSD.org>; 发送时间: 2014年6月20日(星期五) 凌晨3:04 收件人: "张晗"<zganghanhan@foxmail.com>; "freebsd-net"<freebsd-net@freebsd.org>; 主题: Re: pow function in kernel space There is no floating point types in kernel, so there is no pow() in kernel. On 6/19/14, 5:40 AM, 张晗 wrote: > how can I implement, in an efficient, way the pow() function in kernel space ? Is there any function I can use o r how I can evaluate pow function in kernel model? > > Thanks! > > > ------------------ > > 祝好， > > 张晗 > > > > ---------- > > HanZhang > -- Andrey Zonov
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