我的机器用vmware +freebsd+mysql+php 经常报错negative time of 9199141 usec for pid 491 (vmware-guestd) negative time of 9343773 usec for pid 491 (vmware-guestd) negative time of 9352006 usec for pid 491 (vmware-guestd) 不知道怎么引起的，怎么解决呀

Two special operators influence the replacement process. First, if an occurrence of a parameter in the replacement token sequence is immediately preceded by #, string quotes (") are placed around the corresponding parameter, and then both the # and the parameter identifier are replaced by the quoted argument. A \ character is inserted before each " or \ character that appears surrounding, or in...

我对negative cache的理解是，针对某一个查询如果权威服务器返回的结果的RCODE是NXDOMAIN或者是NODATA.并且返回了SOA记录，那么cache dns server可以缓存这个应答。 缓存该“否定”应答的ttl是soa的ttl(soa记录的最后一个域，而不是 soa记录在dns cache server里还剩余的ttl),但是不超过cache dns server里面设置的最大值，bind9是3h,pdns-recursor是1h. 我做了一个测试，基本上是和上面的理解一致。不过遇到一个不解的地方就是，...

請問各朋友們, 我的sco unix 5.04在起動時出現以下警告, 電腦運行起來的時間非常慢, 請問有沒有以下錯誤的解決方法. H KSL init SST expansion has failure detected for minor devices 0 to 63 SST watchdog timer expired expansion bus disabled on devs 0 to 63.

Example 10.18 (Press the Esc Key for [Esc]. 1 $ ls a[Esc]= 1) abc 2) abc1 3) abc122 4) abc123 5) abc2 2 $ ls a[Esc]* ls abc abc1 abc122 abc123 abc2 abc abc1 abc122 abc123 abc2 3 $ print apples pears peaches apples pears peaches 4 $ print [Esc]_ print peaches peaches 5 $ print apples pears peaches plums apples pears peaches 6 $ pr...

复制了一个虚拟机的系统到另外一台机器上，启动以后居然出现了提示： calcru:runtime went backwards from 27466 usec to 27454 usec for pid 75(dd) calcru:negative runtime of -215346 usec for pid 4 (g_down) 查了半天，原来是这样的： 跟中断（interrupt）有关的不同硬体 与/或 软体的搭配都有可能造成 这个问题。这有可能是 bug 或是某个装置本身的问题。在平行埠上使用 大的 MTU 来作 TCP/IP 传输可以重现这个问题。若是...

v2.4.0 我在分析namei.c的sys_unlink函数时发现，已经成为negatvie的dentry(也就是dentry->d_inode==NULL)仍然会被加入dentry_unused中,而不立即释放它。并且prune_dcache也不优先prune这种毫无用途的节点。不知是基于何种考虑要这么做？

谁能举个Shell Parameter expansion的${!PREFIX*} expansion脚本例子？ 看shell文档： ${!prefix*} ${!prefix@} Expands to the names of variables whose names begin with prefix, separat ed by the first character of the IFS special variable. When ‘@’ is used an d the expansion appears within double quotes, each variable name expands to a separate word. 没怎么看明白

注以下192.168.1.223是网关 说明下，我用的是IBM机器，不是VMware虚拟机 May 29 17:24:34 mail kernel: calcru: negative runtime of -1729369 usec for pid 16555 (httpd) May 29 17:24:34 mail kernel: calcru: negative runtime of -459742 usec for pid 806 (cron) May 29 17:24:34 mail kernel: calcru: negative runtime of -69403473 usec for pid 14 (yarrow) May 29 17:24:34 mail kernel: calcru: negative runtime o...

摘　要： The ability to dynamically expand volumes is one of the few remaining differences among today's disk array products. It can significantly affect the amount of time that storage administrators spend provisioning storage. Enterprises should ask vendors to explain the process for provisioning and expanding volumes for each critical application, and then use this information as part of the de...