Re: [PATCH RESEND][pciutils] libpci: pci_id_lookup - add udev/hwdbsupport

[Martin Mares]

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/