From: Rameshwar Prasad Sahu <rsahu-qTEPVZfXA3Y@public.gmane.org>
To: vinod.koul-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org,
dan.j.williams-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org
Cc: dmaengine-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
arnd-r2nGTMty4D4@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
jcm-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
patches-qTEPVZfXA3Y@public.gmane.org,
Rameshwar Prasad Sahu <rsahu-qTEPVZfXA3Y@public.gmane.org>
Subject: [PATCH v2] dmaengine: xgene-dma: Disable memcpy operation due to performance drop
Date: Thu, 8 Oct 2015 14:36:57 +0530 [thread overview]
Message-ID: <1444295217-3099-1-git-send-email-rsahu@apm.com> (raw)
The DMA engine supports memory copy, RAID5 XOR, RAID6 PQ, and other
computations. But the bandwidth of the entire DMA engine is shared
among all channels. This patch re-configures operations availability
such that one can achieve maximum performance for XOR and PQ
computation by removing the memory offload operations.
Signed-off-by: Rameshwar Prasad Sahu <rsahu-qTEPVZfXA3Y@public.gmane.org>
---
drivers/dma/xgene-dma.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/dma/xgene-dma.c b/drivers/dma/xgene-dma.c
index 8d57b1b..cd38022 100644
--- a/drivers/dma/xgene-dma.c
+++ b/drivers/dma/xgene-dma.c
@@ -1707,7 +1707,6 @@ static void xgene_dma_set_caps(struct xgene_dma_chan *chan,
dma_cap_zero(dma_dev->cap_mask);
/* Set DMA device capability */
- dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
dma_cap_set(DMA_SG, dma_dev->cap_mask);
/* Basically here, the X-Gene SoC DMA engine channel 0 supports XOR
--
1.8.2.1
--
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next reply other threads:[~2015-10-08 9:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-08 9:06 Rameshwar Prasad Sahu [this message]
2015-10-09 16:12 ` [PATCH v2] dmaengine: xgene-dma: Disable memcpy operation due to performance drop Vinod Koul
[not found] ` <20151009161208.GJ3609-bQVUxfxUtC13uc1i7fC1zK2pdiUAq4bhAL8bYrjMMd8@public.gmane.org>
2015-10-09 16:38 ` Rameshwar Sahu
2015-10-12 14:23 ` Vinod Koul
2015-10-14 10:20 ` Rameshwar Sahu
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