lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:	Sat, 4 Nov 2006 23:36:49 +0100 (CET)
From:	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>
To:	Albert Cahalan <acahalan@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: 2048 CPUs [was: Re: New filesystem for Linux]

>> Does one Linux kernel run on system with 1024 cpus? I guess it
>> must fry spinlocks... (or even lockup due to spinlock livelocks)
>
> The SGI Altix can have 2048 CPUs.

And does it run one image of Linux? Or more images each on few cpus?

How do they solve problem with spinlock livelocks?

If time-spent-outside-spinlock/time-spent-in-spinlock < number-of-cpus, 
the spinlock livelock may happen --- this condition is not true normally 
with 2 or 4 cpus, but for that high amount of cpus, there is a danger.

Or do they have some special hardware spinlock instruction that guarantees 
fairness?

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

Powered by blists - more mailing lists