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From: "Sigrid Solveig Haflínudóttir" <sigrid@ftrv.se>
To: 9front@9front.org
Subject: Re: [9front] Speeding up snoopy(8)
Date: Thu, 20 Oct 2022 18:03:47 +0200	[thread overview]
Message-ID: <26B1535D9EE1F3549FAB661259CC3845@ftrv.se> (raw)
In-Reply-To: <85db2d6b-e60a-4236-9a2c-5b0b77ef99f6@app.fastmail.com>

Quoth David Arroyo <droyo@aqwari.net>:
> I will experiment with putting the pwrite in a separate thread, and
> look for small performance improvements in the other functions. I
> am not sure why nsec() time is so high, but I think that's a function
> that could perform very differently on real vs virtual hardware, so
> I'm hesitant to try to improve it until I get 9front running on a
> real machine.

nsec() is a function that results in a syscall.  It is also affected
by time adjustments, to my knowledge.  At some point I replaced nsec()
call with a (somewhat dirty) nanosec() in vmx, see

It would be nice to have a way to get monotonic timestamps in userspace
without having to go into the kernel. For now, you can try nanosec and
see if anything changes.

  reply	other threads:[~2022-10-20 16:05 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-18  4:57 droyo
2022-10-20 15:55 ` David Arroyo
2022-10-20 16:03   ` Sigrid Solveig Haflínudóttir [this message]
2022-10-21 15:38     ` David Arroyo
2022-10-21 16:04       ` ori
2022-10-21 16:54         ` David Arroyo
2022-10-21 17:10           ` ori
2022-10-21 17:40       ` Lyndon Nerenberg (VE7TFX/VE6BBM)
2022-10-21 18:52         ` ori
2022-10-21 19:23           ` ori

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