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executor: improve startup time on machines with many CPUs #6482

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Merged
a-nogikh merged 1 commit into from
Nov 26, 2025
Merged

executor: improve startup time on machines with many CPUs #6482

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11 changes: 11 additions & 0 deletions executor/common_linux.h
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Original file line number Diff line number Diff line change
Expand Up @@ -370,6 +370,11 @@ static int netlink_next_msg(struct nlmsg* nlmsg, unsigned int offset,
#endif

#if SYZ_EXECUTOR || SYZ_NET_DEVICES || SYZ_802154

// Force few TX and RX queues per interface to avoid creating 2 sysfs entries
// per CPU per interface which takes a long time on machines with many cores.
static unsigned int queue_count = 2;

static void netlink_add_device_impl(struct nlmsg* nlmsg, const char* type,
const char* name, bool up)
{
Expand All @@ -380,6 +385,10 @@ static void netlink_add_device_impl(struct nlmsg* nlmsg, const char* type,
netlink_init(nlmsg, RTM_NEWLINK, NLM_F_EXCL | NLM_F_CREATE, &hdr, sizeof(hdr));
if (name)
netlink_attr(nlmsg, IFLA_IFNAME, name, strlen(name));

netlink_attr(nlmsg, IFLA_NUM_TX_QUEUES, &queue_count, sizeof(queue_count));
netlink_attr(nlmsg, IFLA_NUM_RX_QUEUES, &queue_count, sizeof(queue_count));

netlink_nest(nlmsg, IFLA_LINKINFO);
netlink_attr(nlmsg, IFLA_INFO_KIND, type, strlen(type));
}
Expand All @@ -405,6 +414,8 @@ static void netlink_add_veth(struct nlmsg* nlmsg, int sock, const char* name,
netlink_nest(nlmsg, VETH_INFO_PEER);
nlmsg->pos += sizeof(struct ifinfomsg);
netlink_attr(nlmsg, IFLA_IFNAME, peer, strlen(peer));
netlink_attr(nlmsg, IFLA_NUM_TX_QUEUES, &queue_count, sizeof(queue_count));
netlink_attr(nlmsg, IFLA_NUM_RX_QUEUES, &queue_count, sizeof(queue_count));
netlink_done(nlmsg);
netlink_done(nlmsg);
netlink_done(nlmsg);
Expand Down