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Re: [Qemu-devel] [Qemu-stable][PATCH] rdma: fix multiple VMs parallel mi
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From: |
Frank Yang |
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Subject: |
Re: [Qemu-devel] [Qemu-stable][PATCH] rdma: fix multiple VMs parallel migration |
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Date: |
Wed, 04 Sep 2013 10:42:48 +0800 |
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User-agent: |
Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130801 Thunderbird/17.0.8 |
On 2013-9-3 13:03, Lei Li wrote:
> Hi Frank,
>
> I failed to apply this patch. Please make sure to use git-send-email,
> otherwise
> it's a little hard to review. :)
>
> On 08/30/2013 08:39 PM, Frank Yang wrote:
>> When several VMs migrate with RDMA at the same time, the increased pressure
>> cause packet loss probabilistically and make source and destination wait for
>> each other. There might be some of VMs blocked during the migration.
>>
>> Fix the bug by using two completion queues, for sending and receiving
>> respectively.
>
>>
>> From 0c4829495cdc89eea2e94b103ac42c3f6a4b32c2 Mon Sep 17 00:00:00 2001
>> From: Frank Yang <address@hidden <mailto:address@hidden>>
>> Date: Fri, 30 Aug 2013 17:53:34 +0800
>> Subject: [PATCH] rdma: fix multiple VMs parallel migration
>
> The commit message should be here within the patch. You can use 'git commit
> --amend'
> to add it.
>
>
>>
>> Signed-off-by: Frank Yang <address@hidden <mailto:address@hidden>>
>> ---
>> migration-rdma.c | 57
>> ++++++++++++++++++++++++++++++++++++--------------------
>> 1 file changed, 37 insertions(+), 20 deletions(-)
>>
>> diff --git a/migration-rdma.c b/migration-rdma.c
>> index 3d1266f..d0eacbb 100644
>> --- a/migration-rdma.c
>> +++ b/migration-rdma.c
>> @@ -362,7 +362,8 @@ typedef struct RDMAContext {
>> struct ibv_qp *qp; /* queue pair */
>> struct ibv_comp_channel *comp_channel; /* completion channel */
>> struct ibv_pd *pd; /* protection domain */
>> - struct ibv_cq *cq; /* completion queue */
>> + struct ibv_cq *send_cq; /* send completion queue */
>> + struct ibv_cq *recv_cq; /* receive completion queue */
>> /*
>> * If a previous write failed (perhaps because of a failed
>> @@ -1006,9 +1007,12 @@ static int qemu_rdma_alloc_pd_cq(RDMAContext *rdma)
>> * Completion queue can be filled by both read and write work requests,
>> * so must reflect the sum of both possible queue sizes.
>> */
>> - rdma->cq = ibv_create_cq(rdma->verbs, (RDMA_SIGNALED_SEND_MAX * 3),
>> + rdma->send_cq = ibv_create_cq(rdma->verbs, (RDMA_SIGNALED_SEND_MAX * 2),
>> NULL, rdma->comp_channel, 0);
>> - if (!rdma->cq) {
>> + rdma->recv_cq = ibv_create_cq(rdma->verbs, RDMA_SIGNALED_SEND_MAX, NULL,
>> + rdma->comp_channel, 0);
>> +
>> + if (!rdma->send_cq || !rdma->recv_cq) {
>> fprintf(stderr, "failed to allocate completion queue\n");
>> goto err_alloc_pd_cq;
>> }
>> @@ -1040,8 +1044,8 @@ static int qemu_rdma_alloc_qp(RDMAContext *rdma)
>> attr.cap.max_recv_wr = 3;
>> attr.cap.max_send_sge = 1;
>> attr.cap.max_recv_sge = 1;
>> - attr.send_cq = rdma->cq;
>> - attr.recv_cq = rdma->cq;
>> + attr.send_cq = rdma->send_cq;
>> + attr.recv_cq = rdma->recv_cq;
>> attr.qp_type = IBV_QPT_RC;
>> ret = rdma_create_qp(rdma->cm_id, rdma->pd, &attr);
>> @@ -1361,13 +1365,18 @@ static void qemu_rdma_signal_unregister(RDMAContext
>> *rdma, uint64_t index,
>> * Return the work request ID that completed.
>> */
>> static uint64_t qemu_rdma_poll(RDMAContext *rdma, uint64_t *wr_id_out,
>> - uint32_t *byte_len)
>> + uint32_t *byte_len, int wrid_requested)
>> {
>> int ret;
>> struct ibv_wc wc;
>> uint64_t wr_id;
>> - ret = ibv_poll_cq(rdma->cq, 1, &wc);
>> + if (wrid_requested == RDMA_WRID_RDMA_WRITE ||
>> + wrid_requested == RDMA_WRID_SEND_CONTROL) {
>> + ret = ibv_poll_cq(rdma->send_cq, 1, &wc);
>> + } else if (wrid_requested >= RDMA_WRID_RECV_CONTROL) {
>> + ret = ibv_poll_cq(rdma->recv_cq, 1, &wc);
>> + }
>> if (!ret) {
>> *wr_id_out = RDMA_WRID_NONE;
>> @@ -1460,12 +1469,9 @@ static int qemu_rdma_block_for_wrid(RDMAContext
>> *rdma, int wrid_requested,
>> void *cq_ctx;
>> uint64_t wr_id = RDMA_WRID_NONE, wr_id_in;
>> - if (ibv_req_notify_cq(rdma->cq, 0)) {
>> - return -1;
>> - }
>> /* poll cq first */
>> while (wr_id != wrid_requested) {
>> - ret = qemu_rdma_poll(rdma, &wr_id_in, byte_len);
>> + ret = qemu_rdma_poll(rdma, &wr_id_in, byte_len, wrid_requested);
>> if (ret < 0) {
>> return ret;
>> }
>> @@ -1487,6 +1493,17 @@ static int qemu_rdma_block_for_wrid(RDMAContext
>> *rdma, int wrid_requested,
>> }
>> while (1) {
>> + if (wrid_requested == RDMA_WRID_RDMA_WRITE ||
>> + wrid_requested == RDMA_WRID_SEND_CONTROL) {
>> + if (ibv_req_notify_cq(rdma->send_cq, 0)) {
>> + return -1;
>> + }
>> + } else if (wrid_requested >= RDMA_WRID_RECV_CONTROL) {
>> + if (ibv_req_notify_cq(rdma->recv_cq, 0)) {
>> + return -1;
>> + }
>> + }
>> +
>> /*
>> * Coroutine doesn't start until process_incoming_migration()
>> * so don't yield unless we know we're running inside of a
>> coroutine.
>> @@ -1502,12 +1519,8 @@ static int qemu_rdma_block_for_wrid(RDMAContext
>> *rdma, int wrid_requested,
>> num_cq_events++;
>> - if (ibv_req_notify_cq(cq, 0)) {
>> - goto err_block_for_wrid;
>> - }
>> -
>> while (wr_id != wrid_requested) {
>> - ret = qemu_rdma_poll(rdma, &wr_id_in, byte_len);
>> + ret = qemu_rdma_poll(rdma, &wr_id_in, byte_len, wrid_requested);
>> if (ret < 0) {
>> goto err_block_for_wrid;
>> }
>> @@ -2236,9 +2249,13 @@ static void qemu_rdma_cleanup(RDMAContext *rdma)
>> ibv_destroy_qp(rdma->qp);
>> rdma->qp = NULL;
>> }
>> - if (rdma->cq) {
>> - ibv_destroy_cq(rdma->cq);
>> - rdma->cq = NULL;
>> + if (rdma->send_cq) {
>> + ibv_destroy_cq(rdma->send_cq);
>> + rdma->send_cq = NULL;
>> + }
>> + if (rdma->recv_cq) {
>> + ibv_destroy_cq(rdma->recv_cq);
>> + rdma->recv_cq = NULL;
>> }
>> if (rdma->comp_channel) {
>> ibv_destroy_comp_channel(rdma->comp_channel);
>> @@ -2770,7 +2787,7 @@ static size_t qemu_rdma_save_page(QEMUFile *f, void
>> *opaque,
>> */
>> while (1) {
>> uint64_t wr_id, wr_id_in;
>> - int ret = qemu_rdma_poll(rdma, &wr_id_in, NULL);
>> + int ret = qemu_rdma_poll(rdma, &wr_id_in, NULL,
>> RDMA_WRID_RDMA_WRITE);
>> if (ret < 0) {
>> fprintf(stderr, "rdma migration: polling error! %d\n", ret);
>> goto err;
>> --
>> 1.8.3.msysgit.0
>>
>>
>
>
Understood. Thank you. The following patch should be fine.
>From 7b7d2c5b51c53c23f7194d35b469dedd892ef89f Mon Sep 17 00:00:00 2001
From: Frank Yang <address@hidden>
Date: Tue, 3 Sep 2013 18:26:54 +0800
Subject: [PATCH] rdma: fix multiple VMs parallel migration
Signed-off-by: Frank Yang <address@hidden>
---
migration-rdma.c | 64 +++++++++++++++++++++++++++++++++++++-------------------
1 file changed, 42 insertions(+), 22 deletions(-)
diff --git a/migration-rdma.c b/migration-rdma.c
index 3d1266f..30f8c11 100644
--- a/migration-rdma.c
+++ b/migration-rdma.c
@@ -362,7 +362,8 @@ typedef struct RDMAContext {
struct ibv_qp *qp; /* queue pair */
struct ibv_comp_channel *comp_channel; /* completion channel */
struct ibv_pd *pd; /* protection domain */
- struct ibv_cq *cq; /* completion queue */
+ struct ibv_cq *send_cq; /* send completion queue */
+ struct ibv_cq *recv_cq; /* receive completion queue */
/*
* If a previous write failed (perhaps because of a failed
@@ -1003,12 +1004,18 @@ static int qemu_rdma_alloc_pd_cq(RDMAContext *rdma)
}
/*
- * Completion queue can be filled by both read and write work requests,
- * so must reflect the sum of both possible queue sizes.
+ * Create two completion queues for sending and receiving
+ * respectively.
+ * Send completion queue can be filled by both send and
+ * write work requests, so must reflect the sum of both
+ * possible queue sizes.
*/
- rdma->cq = ibv_create_cq(rdma->verbs, (RDMA_SIGNALED_SEND_MAX * 3),
+ rdma->send_cq = ibv_create_cq(rdma->verbs, (RDMA_SIGNALED_SEND_MAX * 2),
NULL, rdma->comp_channel, 0);
- if (!rdma->cq) {
+ rdma->recv_cq = ibv_create_cq(rdma->verbs, RDMA_SIGNALED_SEND_MAX, NULL,
+ rdma->comp_channel, 0);
+
+ if (!rdma->send_cq || !rdma->recv_cq) {
fprintf(stderr, "failed to allocate completion queue\n");
goto err_alloc_pd_cq;
}
@@ -1040,8 +1047,8 @@ static int qemu_rdma_alloc_qp(RDMAContext *rdma)
attr.cap.max_recv_wr = 3;
attr.cap.max_send_sge = 1;
attr.cap.max_recv_sge = 1;
- attr.send_cq = rdma->cq;
- attr.recv_cq = rdma->cq;
+ attr.send_cq = rdma->send_cq;
+ attr.recv_cq = rdma->recv_cq;
attr.qp_type = IBV_QPT_RC;
ret = rdma_create_qp(rdma->cm_id, rdma->pd, &attr);
@@ -1361,13 +1368,18 @@ static void qemu_rdma_signal_unregister(RDMAContext
*rdma, uint64_t index,
* Return the work request ID that completed.
*/
static uint64_t qemu_rdma_poll(RDMAContext *rdma, uint64_t *wr_id_out,
- uint32_t *byte_len)
+ uint32_t *byte_len, int wrid_requested)
{
int ret;
struct ibv_wc wc;
uint64_t wr_id;
- ret = ibv_poll_cq(rdma->cq, 1, &wc);
+ if (wrid_requested == RDMA_WRID_RDMA_WRITE ||
+ wrid_requested == RDMA_WRID_SEND_CONTROL) {
+ ret = ibv_poll_cq(rdma->send_cq, 1, &wc);
+ } else if (wrid_requested >= RDMA_WRID_RECV_CONTROL) {
+ ret = ibv_poll_cq(rdma->recv_cq, 1, &wc);
+ }
if (!ret) {
*wr_id_out = RDMA_WRID_NONE;
@@ -1460,12 +1472,9 @@ static int qemu_rdma_block_for_wrid(RDMAContext *rdma,
int wrid_requested,
void *cq_ctx;
uint64_t wr_id = RDMA_WRID_NONE, wr_id_in;
- if (ibv_req_notify_cq(rdma->cq, 0)) {
- return -1;
- }
/* poll cq first */
while (wr_id != wrid_requested) {
- ret = qemu_rdma_poll(rdma, &wr_id_in, byte_len);
+ ret = qemu_rdma_poll(rdma, &wr_id_in, byte_len, wrid_requested);
if (ret < 0) {
return ret;
}
@@ -1487,6 +1496,17 @@ static int qemu_rdma_block_for_wrid(RDMAContext *rdma,
int wrid_requested,
}
while (1) {
+ if (wrid_requested == RDMA_WRID_RDMA_WRITE ||
+ wrid_requested == RDMA_WRID_SEND_CONTROL) {
+ if (ibv_req_notify_cq(rdma->send_cq, 0)) {
+ return -1;
+ }
+ } else if (wrid_requested >= RDMA_WRID_RECV_CONTROL) {
+ if (ibv_req_notify_cq(rdma->recv_cq, 0)) {
+ return -1;
+ }
+ }
+
/*
* Coroutine doesn't start until process_incoming_migration()
* so don't yield unless we know we're running inside of a coroutine.
@@ -1502,12 +1522,8 @@ static int qemu_rdma_block_for_wrid(RDMAContext *rdma,
int wrid_requested,
num_cq_events++;
- if (ibv_req_notify_cq(cq, 0)) {
- goto err_block_for_wrid;
- }
-
while (wr_id != wrid_requested) {
- ret = qemu_rdma_poll(rdma, &wr_id_in, byte_len);
+ ret = qemu_rdma_poll(rdma, &wr_id_in, byte_len, wrid_requested);
if (ret < 0) {
goto err_block_for_wrid;
}
@@ -2236,9 +2252,13 @@ static void qemu_rdma_cleanup(RDMAContext *rdma)
ibv_destroy_qp(rdma->qp);
rdma->qp = NULL;
}
- if (rdma->cq) {
- ibv_destroy_cq(rdma->cq);
- rdma->cq = NULL;
+ if (rdma->send_cq) {
+ ibv_destroy_cq(rdma->send_cq);
+ rdma->send_cq = NULL;
+ }
+ if (rdma->recv_cq) {
+ ibv_destroy_cq(rdma->recv_cq);
+ rdma->recv_cq = NULL;
}
if (rdma->comp_channel) {
ibv_destroy_comp_channel(rdma->comp_channel);
@@ -2770,7 +2790,7 @@ static size_t qemu_rdma_save_page(QEMUFile *f, void
*opaque,
*/
while (1) {
uint64_t wr_id, wr_id_in;
- int ret = qemu_rdma_poll(rdma, &wr_id_in, NULL);
+ int ret = qemu_rdma_poll(rdma, &wr_id_in, NULL, RDMA_WRID_RDMA_WRITE);
if (ret < 0) {
fprintf(stderr, "rdma migration: polling error! %d\n", ret);
goto err;
--
1.8.3.msysgit.0