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The Lounge War Stories Linus Torvalds reply about Meltdown and Spectre. Post 303012275 by Corona688 on Thursday 1st of February 2018 04:07:36 PM
Old 02-01-2018
Quote:
Originally Posted by dodona
I read that with the 4.15 Kernel with build-in patches for the hypothetical problem comes with 15-30% performance loss.
That's way overblown, because the performance loss happens during the switch between userspace and kernelspace. Sensible programs don't spend most of their time doing thousands of tiny system calls.

A 30% reduction in performance there is bad, but not the same as a 30% slower computer.
 

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lpana(1M)																 lpana(1M)

NAME
lpana - display LP spooler performance analysis information SYNOPSIS
dest] DESCRIPTION
displays LP spooler performance information, which system administrators can use to optimize the configuration of the entire spooler sys- tem. Options recognizes one option: Choose dest as the printer or the class of printers. If dest is a printer, the performance analysis information is dis- played for that specific printer. If dest is a class of printers, the performance analysis information is displayed for the printers that are members of the class. By default, displays the performance analysis information for all printers and/or classes. examines for the following items: Average waiting time from when job is spooled until start of printing. Standard Deviation for waiting time. Average printing time from start to end of job. Standard Deviation for printing time. Average of number of bytes printed per request. Standard Deviation for number of bytes. Sum of bytes printed for all requests (in kilobytes). Total number of requests since logging started. EXTERNAL INFLUENCES
Environment Variables determines the language in which messages are displayed. Setting causes the destination names exceeding 14 characters to be wrapped to multiple lines. This will ensure proper indentation of all the other displayed fields. WARNINGS
performs its operation on the local system only. AUTHOR
was developed by HP. FILES
SEE ALSO
lp(1), lpstat(1), lpadmin(1M), lpsched(1M). lpana(1M)
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