From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: "David Gibson" <david@gibson.dropbear.id.au>,
"Cédric Le Goater" <clg@kaod.org>
Cc: linuxppc-dev@lists.ozlabs.org,
Michael Ellerman <mpe@ellerman.id.au>,
Paul Mackerras <paulus@samba.org>
Subject: Re: [PATCH 02/10] powerpc/xive: guest exploitation of the XIVE interrupt controller
Date: Thu, 10 Aug 2017 14:46:00 +1000 [thread overview]
Message-ID: <1502340360.2563.53.camel@kernel.crashing.org> (raw)
In-Reply-To: <20170810042849.GU13670@umbus.fritz.box>
On Thu, 2017-08-10 at 14:28 +1000, David Gibson wrote:
>
> Also, will POWER9 always have doorbells? In which case you could
> reduce it to 3 options.
The problem with doorbells on POWER9 guests is that they may have
to trap and be emulated by the hypervisor, since the guest threads
on P9 don't have to match the HW threads of the core.
Thus it's quite possible that using XIVE for IPIs is actually faster
than doorbells in that case.
Cheers,
Ben.
next prev parent reply other threads:[~2017-08-10 4:46 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-08 8:56 [PATCH 00/10] guest exploitation of the XIVE interrupt controller Cédric Le Goater
2017-08-08 8:56 ` [PATCH 01/10] powerpc/xive: fix OV5_XIVE_EXPLOIT bits Cédric Le Goater
2017-08-08 8:56 ` [PATCH 02/10] powerpc/xive: guest exploitation of the XIVE interrupt controller Cédric Le Goater
2017-08-09 3:53 ` David Gibson
2017-08-09 8:48 ` Cédric Le Goater
2017-08-10 4:28 ` David Gibson
2017-08-10 4:46 ` Benjamin Herrenschmidt [this message]
2017-08-10 5:54 ` David Gibson
2017-08-10 7:04 ` Cédric Le Goater
2017-08-10 6:45 ` Cédric Le Goater
2017-08-10 11:33 ` Benjamin Herrenschmidt
2017-08-10 7:19 ` Cédric Le Goater
2017-08-10 11:36 ` Benjamin Herrenschmidt
2017-08-11 3:55 ` David Gibson
2017-08-08 8:56 ` [PATCH 03/10] powerpc/xive: rename xive_poke_esb in xive_esb_read Cédric Le Goater
2017-08-09 3:55 ` David Gibson
2017-08-09 7:12 ` Cédric Le Goater
2017-08-09 7:31 ` David Gibson
2017-08-08 8:56 ` [PATCH 04/10] powerpc/xive: introduce xive_esb_write Cédric Le Goater
2017-08-08 8:56 ` [PATCH 05/10] powerpc/xive: add the HW IRQ number under xive_irq_data Cédric Le Goater
2017-08-08 8:56 ` [PATCH 06/10] powerpc/xive: introduce H_INT_ESB hcall Cédric Le Goater
2017-08-08 8:56 ` [PATCH 07/10] powerpc/xive: add XIVE exploitation mode to CAS Cédric Le Goater
2017-08-10 10:20 ` Cédric Le Goater
2017-08-08 8:56 ` [PATCH 08/10] powerpc/xive: take into account '/ibm, plat-res-int-priorities' Cédric Le Goater
2017-08-09 4:02 ` [PATCH 08/10] powerpc/xive: take into account '/ibm,plat-res-int-priorities' David Gibson
2017-08-09 7:14 ` Cédric Le Goater
2017-08-10 0:54 ` David Gibson
2017-08-08 8:56 ` [PATCH 09/10] powerpc/xive: improve debugging macros Cédric Le Goater
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