Re: [PATCH 0/2] Better handling of slow remote transfers

Gary Benson
2015-08-20T18:01:27Z

Pedro Alves wrote:
> Hey, that was a quick and dirty patch. :-)

I know, no worries :)

> Here's a cleaned up version. WDYT?
[snip
> This patch almost halves the time it takes to "target remote + run
> to main" on a higher-latency connection.
>
> E.g., I've got a ping time of ~85ms to an x86-64 machine on the gcc
> compile farm (almost 2000km away from me), and I'm behind a ~16Mbit
> ADSL. When I connect to a gdbserver debugging itself on that machine
> and run to main, it takes almost 55 seconds:
[snip]
> real 0m54.803s
> user 0m0.329s
> sys 0m0.064s
>
> While the readahead cache added by this patch, it drops to:
>
> real 0m29.462s
> user 0m0.454s
> sys 0m0.054s
>
> I added a few counters to show cache hit/miss, and got:
>
> readahead cache miss 142
> readahead cache hit 310
>
> Tested on x86_64 Fedora 20.

Very nice, please commit!

Thanks,
Gary

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