lkml.org 
[lkml]   [2013]   [Dec]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH RESEND][pciutils] libpci: pci_id_lookup - add udev/hwdb support
Hello Kay,

> Libpci and its linear search through megabytes of text files for evey
> new query is too inefficient, that we cannot afford to use it during
> early bootup. It was the largest hit left in bootup profiling on
> machines booting userspace in the sub-1-second range on common
> machines. It was probably never meant to provide efficient queries,
> but it's the reason we can never use it during early boot.

I do not know what you are speaking about -- libpci definitely does
not perform linear scans on pci.ids. It builds a hash table from pci.ids
on the first query and and all subsequent queries are O(1) on average.

Martin


\
 
 \ /
  Last update: 2013-12-15 11:01    [W:0.099 / U:1.752 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site