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From: | Paolo Bonzini |
Subject: | Re: [Qemu-devel] [RFC v1 01/11] tcg: move tb_find_fast outside the tb_lock critical section |
Date: | Tue, 22 Mar 2016 09:29:42 +0100 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 |
On 22/03/2016 00:59, Emilio G. Cota wrote: > Good point. Most of my tests have been on x86-on-x86, and the > difference there (for many CPU-intensive benchmarks such as SPEC) was > negligible. > > Just tested the current master booting Alex' debian ARM image, without > LRU, and I see a 20% increase in boot time. > > I'll add per-bucket locks to keep the same behaviour without hurting > scalability. You probably should skip the MRU move if the TB is not within the first N items of the list (e.g. N=4). Then you take the lock much less. Paolo
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