Messages in this thread | | | Subject | Re: [RFC PATCH 0/3] Add a new flag for ITS device to control indirect route | From | "majun (Euler7)" <> | Date | Fri, 2 Dec 2016 17:29:50 +0800 |
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在 2016/12/1 17:07, Marc Zyngier 写道: > On 01/12/16 07:45, Majun wrote: >> From: MaJun <majun258@huawei.com> >> >> For current ITS driver, two level table (indirect route) is enabled when the memory used >> for LPI route table over the limit(64KB * 2) size. But this function impact the >> performance of LPI interrupt actually because need more time to look up the table. > > Are you implying that your ITS doesn't have a cache to lookup the most > active devices, hence performing a full lookup on each interrupt?
Our ITS chip has the cache with depth 64. But this seems not enough for some scenario,espeically on virtulization platform. > > Anyway, doing this as a DT quirk doesn't feel right. Please use the ITS > quirk infrastructure.
If there is no other better solutions, I will do this.
Thanks! Majun
> > Thanks, > > M. >
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