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Groups > linux.kernel > #1280151
| From | Sunil Goutham <sunil.kovvuri@gmail.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 03/13] net: thunderx: Increase transmit queue length |
| Date | 2015-11-30 19:20 +0100 |
| Message-ID | <qABdn-76v-7@gated-at.bofh.it> (permalink) |
| References | <ds889-8u2-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
From: Sunil Goutham <sgoutham@cavium.com> Under high transmit rates and with TSO enabled observing fluctuations in TX performance. Seen especially with iperf3 application. Since TSO is taken care at driver level, with 64KB of TSO packets and when window size is also high the rate at which CPU fills in transmit descriptors is much higher than what HW is able to process. Each 64KB TSO packet occupies gets segmented to ~43 1500 byte MTU packets and occupies ~130 descriptors. Hence increasing transmit queue size. Signed-off-by: Sunil Goutham <sgoutham@cavium.com> --- drivers/net/ethernet/cavium/thunder/nicvf_queues.h | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.h b/drivers/net/ethernet/cavium/thunder/nicvf_queues.h index fb4957d..b1e93a9 100644 --- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.h +++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.h @@ -62,7 +62,7 @@ #define SND_QUEUE_CNT 8 #define CMP_QUEUE_CNT 8 /* Max of RCV and SND qcount */ -#define SND_QSIZE SND_QUEUE_SIZE2 +#define SND_QSIZE SND_QUEUE_SIZE3 #define SND_QUEUE_LEN (1ULL << (SND_QSIZE + 10)) #define MAX_SND_QUEUE_LEN (1ULL << (SND_QUEUE_SIZE6 + 10)) #define SND_QUEUE_THRESH 2ULL @@ -73,7 +73,7 @@ /* Keep CQ and SQ sizes same, if timestamping * is enabled this equation will change. */ -#define CMP_QSIZE CMP_QUEUE_SIZE2 +#define CMP_QSIZE CMP_QUEUE_SIZE3 #define CMP_QUEUE_LEN (1ULL << (CMP_QSIZE + 10)) #define CMP_QUEUE_CQE_THRESH 0 #define CMP_QUEUE_TIMER_THRESH 220 /* 10usec */ -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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[PATCH 03/13] net: thunderx: Increase transmit queue length Sunil Goutham <sunil.kovvuri@gmail.com> - 2015-11-30 19:20 +0100
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