Hi, Bin Liu <binmlist@xxxxxxxxx> writes: > [ text/plain ] > Hi, > > On Fri, Mar 11, 2016 at 6:54 AM, Felipe Balbi > <felipe.balbi@xxxxxxxxxxxxxxx> wrote: >> previously we were using a maximum of 32 TRBs per >> endpoint. With each TRB being 16 bytes long, we were >> using 512 bytes of memory for each endpoint. >> >> However, SLAB/SLUB will always allocate PAGE_SIZE >> chunks. In order to better utilize the memory we >> allocate and to allow deeper queues for gadgets >> which would benefit from it (g_ether comes to mind), >> let's increase the maximum to 256 TRBs which rounds >> up to 4096 bytes for each endpoint. > > Do we want to increase the same for event ring buffers as > while, which is allocated by dma_alloc_coherent(), which > is also at PAGE_SIZE chunks, right? I could, but that's much less important. Currently we have up to 2 events per endpoint which is very, very unlikely to happen. Plus, in that case there's no tangible benefit. $subject, however, I've been using on some performance optimization I've been trying to achieve (not ready for submission just yet). -- balbi
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